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This document describes enhancements introduced in Cisco IOS Release 12.1(3)T that expand the trunk conditioning feature on the Cisco 2600 and 3600 series routers and Cisco MC3810 series concentrators.
This document includes the following sections:
Trunk conditioning is applicable to permanent point-to-point voice connections (private lines and tie-lines) created using the Cisco connection trunk command. This feature provides the following two capabilities:
This feature applies to analog telephony connections and digital T1/E1 using CAS/robbed-bit "ABCD" signaling. It does not apply to digital T1/E1 connections using CCS type signaling.
Trunk conditioning provides for OOS signaling and suppression of voice traffic for trunks in the idle or OOS states. The outgoing (to PBX) OOS condition can be signaled using an ABCD bit pattern that may be different from the busy or seized state. This allows the PBX to differentiate between OOS and congestion (all circuits in use) if the PBX supports this functionality. To detect an incoming OOS (from PBX), the ABCD signaling presented during the OOS condition must be different from busy or seized signaling.
If the system carries T1/E1 CAS/robbed-bit ABCD signaling in transparent pass-through mode for arbitrary, unknown, or unsupported CAS/robbed-bit protocols, it is necessary to define explicit on-hook/idle patterns so that the DSP/signaling code can sense the idle call state and shut off the flow of voice packets when no active call is in progress. This provides an additional idle bandwidth saving mechanism for cases in which bandwidth saving using Voice Activity Detection (VAD) is not desired.
The following restrictions and limitations apply to trunk conditioning:
Cisco IOS Multiservice Applications Configuration Guide, Cisco IOS Release 12.1
Cisco IOS Multiservice Applications Command Reference, Cisco IOS Release 12.1
This feature is supported on the following Cisco platforms:
North America Channel Associated Signaling (CAS) protocol.
The trunk-conditioning features described in this document require Cisco IOS Release 12.1(3)T or later.
Before you can configure trunk conditioning, you must have already configured one of the following:
For more information on the above configuration procedures, see the Cisco IOS Multiservice Applications Configuration Guide for Cisco IOS Release 12.1.
To configure trunk conditioning on Cisco and FRF.11 trunks, complete the following tasks as required:
A voice class defines a specific set of signaling attributes for trunk conditioning. When you assign a voice class to network dial peers or to voice ports, you apply the set of defined signaling attributes with one command.
To configure a voice class for trunk conditioning, complete the following steps beginning in global configuration mode:
| Command | Purpose | |||
|---|---|---|---|---|
Step 1 | router(config)# voice class permanent tag | Create a voice class for Cisco trunk (private line) or FRF.11 trunk calls. The range for the tag number is 1 to 10000. The tag number must be unique on the router.
| ||
Step 2 | router(config-voice-class)# signal keepalive seconds | (Optional) Configure the keepalive signaling packet interval in seconds for Cisco trunk (private line) calls. The range for seconds is 1 to 65535; the default is 5. | ||
Step 3 | router(config-voice-class)# signal sequence oos | (Optional) Change the signaling pattern to be sent to the PBX whenever the far-end keepalive message is lost, or when AIS is received from the far end. Select no-action to send no signaling pattern. Select idle-only or oos-only to send only one signaling pattern. Select both or the no form to restore the default (both signaling patterns are sent). | ||
Step 4 | router(config-voice-class)# signal pattern
{idle | (Optional—Use only to override the default values for the idle patterns and receive OOS pattern, or to configure an OOS transmit signaling pattern) Configure the signal pattern (ABCD bit pattern) for Cisco trunk (private line) calls. Configure both idle receive and idle transmit for the idle state of the call. Configure both oos receive and oos transmit for the out-of-service state. The receive signal pattern is from the data network side to the PBX. The transmit signal pattern is from the PBX to the data network side. The range for all options is 0000 to 1111. If this command is not entered, the default signal patterns are used. See the command reference for defaults. Repeat the command entry for each signal pattern required. | ||
Step 5 | router(config-voice-class)# signal timing oos | (Optional) Do one of the following:
The range for the timeout period is 1 to 65535 seconds; the default is 30 seconds. | ||
Step 6 | router(config-voice-class)# signal timing oos | (Optional) Configure permanent voice connections to be torn down and restarted after the trunk has been out-of-service (OOS) for a specified time. The range for the waiting time is 0 to 65535 seconds.
| ||
Step 7 | router(config-voice-class)# signal timing oos | (Optional) Configure a slave port to return to its initial standby state after the trunk has been out-of-service (OOS) for a specified time. The range for the waiting time is 0 to 65535 seconds.
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Step 8 | router(config-voice-class)# signal timing oos | (Optional) Configure the router or concentrator to stop sending voice packets or voice and signaling packets to the network if it detects a transmit out-of-service (OOS) signaling pattern from the PBX for a specified time. The range for the waiting time is 0 to 65535 seconds.
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Step 9 | router(config-voice-class)# signal timing idle | (Optional) Configure the router or concentrator to stop sending voice packets after the trunk has been idle for a specified time. The range is 0 to 65535 seconds. | ||
Step 10 | router(config-voice-class)# exit | Exit from voice-class configuration mode. |
Assign the voice class to a voice port or dial peer as described in the "Assigning Voice Class Signaling Attributes to Dial Peers or Voice Ports" section, and verify the trunk-conditioning configuration of the voice port or dial peer.
You can assign a voice class to network dial peers (VoFR, VoATM, or VoIP) and to voice ports. You cannot assign voice-class signaling attributes to POTS dial peers.
To assign voice-class signaling attributes to a network dial peer, complete the following steps beginning in global configuration mode:
| Command | Purpose | |||
|---|---|---|---|---|
Step 1 | router(config)# dial-peer voice tag {vofr
| voatm | |
The tag is a number that identifies the dial peer and must be unique on the router. Do not assign duplicate tag numbers. | ||
Step 2 | router(config-dialpeer)# voice-class permanent tag | Assign to the dial peer the voice class that you created in the "Configuring a Voice Class to Define Trunk Conditioning Attributes" section.
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To assign voice-class signaling attributes to a voice port, complete the following steps beginning in global configuration mode:
| Command | Purpose | |||
|---|---|---|---|---|
Step 1 | For Cisco 2600 and 3600 series analog voice ports: router(config)# voice-port slot/subunit/port For Cisco 2600 and 3600 series digital voice ports: router(config)# voice-port slot/port:ds0-group For Cisco MC3810 series analog voice ports: router(config)# voice-port slot/port For Cisco MC3810 series digital voice ports: router(config)# voice-port slot:ds0-group | Identify the voice port you want to configure and enter voice-port configuration mode. | ||
Step 2 | router(config-voiceport)# voice-class permanent tag | Assign to the voice port the voice class that you created in the "Configuring a Voice Class to Define Trunk Conditioning Attributes" section.
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Use the following command(s) to verify the operation of the trunk-conditioning signaling attributes that were applied to a voice port:
| Command | Purpose |
|---|---|
router# show voice trunk-conditioning signaling voice-port | Displays the status of trunk-conditioning signaling and timing parameters for a voice port. |
| router# show voice trunk-conditioning supervisory voice-port | Displays the status of trunk supervision and configuration parameters for a voice port. |
Complete one or more of the following tasks to verify the trunk-conditioning configuration:
router# show running-config Building configuration... Current configuration: . . . voice class permanent 100 signal timing idle suppress-voice 2000 signal timing oos restart 1000 . . . voice-port 0:0 voice-class permanent 100 compand-type a-law ! voice-port 0:1 voice-class permanent 100 compand-type a-law ! voice-port 0:2 voice-class permanent 100 compand-type a-law . . .
router# show voice trunk-conditioning signaling summary 1/1 is shutdown 1/4 is shutdown 1/5 : TX INFO :slow-mode seq#= 25, sig pkt cnt= 40, last-ABCD=0000 hardware-state ACTIVE signal type is NorthamericanCAS signal path is OPEN RX INFO :slow-mode, sig pkt cnt= 36, prev-seq#= 25, last-ABCD=0000
router# show voice trunk-conditioning signaling 1/5 1/5 : TX INFO :slow-mode seq#= 25, sig pkt cnt= 42, last-ABCD=0000 hardware-state ACTIVE signal type is NorthamericanCAS signal path is OPEN 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 RX INFO :slow-mode, sig pkt cnt= 37 missing = 0, out of seq = 0, very late = 0 playout depth = 0 (ms), refill count = 1 prev-seq#= 25, last-ABCD=0000 trunk_down_timer = 4212 (ms), idle timer = 0 (sec), tx_oos_timer = 0 (sec), rx_ais_duration = 0 (ms) forced playout signal pattern = NONE signaling playout history 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
router# show voice trunk-conditioning supervisory summary 1/1 is shutdown 1/4 is shutdown 1/5 : state : TRUNK_SC_CONNECT, voice : on , signal : on ,slave
router# show voice trunk-conditioning supervisory 1/5 1/5 : state : TRUNK_SC_CONNECT, voice : on, signal : on, slave status: trunk connected sequence oos : idle and oos pattern :rx_idle = 0x0 rx_oos = 0xF tx_oos = 0xF timing : idle = 0, restart = 0, standby = 0, timeout = 40 supp_all = 50, supp_voice = 0, keep_alive = 5 timer: oos_ais_timer = 0, timer = 0
router# show voice call summary PORT CODEC VAD VTSP STATE VPM STATE ========= ======== === ===================== ======================== 1/1 *shutdown* 1/2 - - - FXSLS_ONHOOK 1/3 - - - FXSLS_ONHOOK 1/4 *shutdown* 1/5 g729r8 n S_CONNECT S_TRUNKED 1/6 - - - EM_ONHOOK
Creating a Voice Class and Assigning it to Dial Peers
The following example configures a voice class using default idle and oos signaling patterns, and configures busyout to the PBX after a 60-second loss of signaling packets, with restart after 120 seconds. This example assigns the voice class to a Voice over Frame Relay dial peer and to a Voice over ATM dial peer:
router(config)# voice class permanent 10
router(config-class)# signal keepalive 10
router(config-class)# signal timing oos timeout 60
router(config-class)# signal timing idle suppress-voice 5
router(config-class)# signal timing oos restart 120
router(config-class)# exit
router(config)# dial peer voice vofr 10
router(config-dial-peer)# voice-class permanent 10
router(config-dial-peer)# exit
router(config)# dial peer voice voatm 20
router(config-dial-peer)# voice-class permanent 10 router(config-dial-peer)# exit
Creating a Voice Class and Assigning it to a Voice Port
The following example configures a voice class with specified signaling bit patterns for the idle receive, idle transmit, OOS receive, and OOS transmit states, and it configures busyout to the PBX after a 90-second loss of signaling packets, with restart after 240 seconds. This example assigns the voice class to voice port 1:5 in slot 0 on a Cisco 2600 or 3600 series router:
router(config)# voice class permanent 30
router(config-class)# signal keepalive 10
router(config-class)# signal pattern idle receive 0101
router(config-class)# signal pattern idle transmit 0101
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001 router(config-class)# signal timing oos timeout 90
router(config-class)# signal timing idle suppress-voice 5
router(config-class)# signal timing oos restart 240
router(config-class)# exit router(config)# voice-port 0/1:5 router(config-voiceport)# voice-class permanent 30
The following new and modified commands are described in this section (modified commands are marked by an asterisk):
To display the status of trunk-conditioning signaling and timing parameters for a voice port, use the show voice trunk-conditioning signaling EXEC command.
show voice trunk-conditioning signaling [summary | voice-port]Syntax Description
summary | (Optional) Show a summary of the status for all voice ports on the router or concentrator. |
voice-port | (Optional) Show a detailed report for a specified voice port. |
Command Modes
EXEC
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series as show voice permanent-call. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.0(7)XK | This command was renamed show voice trunk-conditioning signaling. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
The show voice trunk-conditioning signaling command displays the trunk signaling status for analog and digital voice ports on Cisco MC3810 series concentrators and Cisco 2600 and 3600 series routers.
Examples
The following is a sample display from the show voice trunk-conditioning signaling summary command for voice ports on a Cisco MC3810 series concentrator:
router# show voice trunk-conditioning signaling summary 1/1 is shutdown 1/4 is shutdown 1/5 : TX INFO :slow-mode seq#= 25, sig pkt cnt= 40, last-ABCD=0000 hardware-state ACTIVE signal type is NorthamericanCAS signal path is OPEN RX INFO :slow-mode, sig pkt cnt= 36, prev-seq#= 25, last-ABCD=0000
The following is a sample display from the show voice trunk-conditioning signaling command for voice port 1/5 on a Cisco MC3810 series concentrator:
router# show voice trunk-conditioning signaling 1/5 1/5 : TX INFO :slow-mode seq#= 25, sig pkt cnt= 42, last-ABCD=0000 hardware-state ACTIVE signal type is NorthamericanCAS signal path is OPEN 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 RX INFO :slow-mode, sig pkt cnt= 37 missing = 0, out of seq = 0, very late = 0 playout depth = 0 (ms), refill count = 1 prev-seq#= 25, last-ABCD=0000 trunk_down_timer = 4212 (ms), idle timer = 0 (sec), tx_oos_timer = 0 (sec), rx_ais_duration = 0 (ms) forced playout signal pattern = NONE signaling playout history 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
The following is a sample display from the show voice trunk-conditioning signaling summary command for voice ports on a Cisco 3600 series router:
router# show voice trunk-conditioning signaling summary 2/0/0 is shutdown 2/0/1 is shutdown 3/0:0 8 is shutdown 3/0:1 1 is shutdown 3/0:2 2 is shutdown 3/0:3 3 is shutdown 3/0:5 5 is shutdown 3/0:6(6) : status : 3/0:7 7 is shutdown 3/1:0 8 is shutdown 3/1:1 1 is shutdown 3/1:3 3 is shutdown 3/1:5 5 is shutdown 3/1:7 7 is shutdown
The following is a sample display from the show voice trunk-conditioning signaling command for voice port 3/0:6 on a Cisco 3600 series router:
router# show voice trunk-conditioning signaling 3/0:6 hardware-state ACTIVE signal type is NorthamericanCAS status : forced playout pattern = STOPPED trunk_down_timer = 0, rx_ais_duration = 0, idle_timer = 0
Table 1 explains the fields in the sample output.
| Field | Description |
|---|---|
current timer | Time since last signaling packets were received. |
forced playout pattern | Which forced playout pattern is sent to PBX: 0 = no forced playout pattern is sent 1 = receive IDLE playout pattern is sent 2 = receive OOS playout pattern is sent |
hardware-state | Hardware state based on received IDLE pattern: IDLE = both sides are idle ACTIVE = at least one side is active |
signal type | Signaling type used by lower level driver: northamerica, melcas, transparent, or external. |
idle timer | Time the hardware on both sides has been in idle state. |
last-ABCD | Last received or transmitted signal bit pattern. |
max inter-arrival time | Maximum interval between received signaling packets. |
missing | Number of missed signal packets. |
mode | Signaling packet generation frequency: fast mode = every 4 milliseconds slow mode = same frequency as keepalive timer |
out of seq | Number of out-of-sequence signal packets. |
playout depth | Number of packets in playout buffer. |
prev-seq# | Sequence number of previous signaling packet. |
refill count | Number of packets created to maintain nominal length of playout packet buffer. |
rx_ais_duration | Time since receipt of AIS indicator. |
seq# | Sequence number of signaling packet. |
sig pkt cnt | Number of transmitted or received signaling packets. |
signal path | Status of signaling path. |
signaling playout history | Signaling bits received in last 60 milliseconds. |
trunk_down_timer | Time since last signaling packets were received. |
tx_oos_timer | Time since PBX started sending OOS signaling pattern defined by signal pattern oos transmit. |
very late | Number of very late signaling packets. |
Related Commands
| Command | Description |
show dial-peer voice | Displays the configuration for all VoIP and POTS dial peers configured on the router. |
show voice dsp | Shows the current status of all DSP voice channels. |
show voice port | Displays configuration information about a specific voice port. |
show voice trunk-conditioning supervisory | Displays the status of trunk supervision and configuration parameters for voice ports. |
To display the status of trunk supervision and configuration parameters for a voice port, use the show voice trunk-conditioning supervisory EXEC command.
show voice trunk-conditioning supervisory [summary | voice-port]Syntax Description
summary | (Optional) Show a summary of the status for all voice ports on the router or concentrator. |
voice-port | (Optional) Show a detailed report for a specified voice port. |
Command Modes
EXEC
Command History
| Release | Modification |
12.0(7)XK | This command was introduced on the Cisco MC3810 series. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
The show voice trunk-conditioning supervisory command displays the trunk supervision and configuration status for analog and digital voice ports.
Examples
The following is a sample display from the show voice trunk-conditioning supervisory summary command for voice ports on a Cisco MC3810 series concentrator:
router# show voice trunk-conditioning supervisory summary 1/1 is shutdown 1/4 is shutdown 1/5 : state : TRUNK_SC_CONNECT, voice : on , signal : on ,slave
The following is a sample display from the show voice trunk-conditioning supervisory command for voice port 1/5 on a Cisco MC3810 series concentrator:
router# show voice trunk-conditioning supervisory 1/5 1/5 : state : TRUNK_SC_CONNECT, voice : on, signal : on, slave status: trunk connected sequence oos : idle and oos pattern :rx_idle = 0x0 rx_oos = 0xF tx_oos = 0xF timing : idle = 0, restart = 0, standby = 0, timeout = 40 supp_all = 50, supp_voice = 0, keep_alive = 5 timer: oos_ais_timer = 0, timer = 0
The following is a sample display from the show voice trunk-conditioning supervisory summary command for voice ports on a Cisco 3600 series router:
router# show voice trunk-conditioning supervisory summary 2/0/0 is shutdown 2/0/1 is shutdown 3/0:0 8 is shutdown 3/0:1 1 is shutdown 3/0:2 2 is shutdown 3/0:3 3 is shutdown 3/0:5 5 is shutdown 3/0:6(6) : state : TRUNK_SC_CONNECT, voice : on , signal : on ,master 3/0:7(7) : state : TRUNK_SC_CONNECT, voice : on , signal : on ,master 3/1:0(8) : state : TRUNK_SC_CONNECT, voice : on , signal : on ,master 3/1:1(1) : state : TRUNK_SC_CONNECT, voice : on , signal : on ,master 3/1:3(3) : state : TRUNK_SC_CONNECT, voice : on , signal : on ,master 3/1:5(5) is shutdown 3/1:7(7) is shutdown
The following is a sample display from the show voice trunk-conditioning supervisory command for voice port 3/0:6 on a Cisco 3600 series router:
router# show voice trunk-conditioning supervisory 3/0:6 3/0:6(6) : state : TRUNK_SC_CONNECT, voice : on, signal : on, master status: trunk connected sequence oos : idle and oos pattern :rx_idle = 0x0 rx_oos = 0xF timing : idle = 0, restart = 0, standby = 0, timeout = 40 supp_all = 0, supp_voice = 0, keep_alive = 5 timer: oos_ais_timer = 0, timer = 0
Table 2 explains the fields in the sample output.
| Field | Description |
|---|---|
keep_alive | Signaling packets periodically sent to the far-end, even if there is no signal change. These signaling packets function as keep-alive messages. |
master | The voice port configured as "connect trunk xxxx". |
slave | The voice port configured as "connect trunk xxxx answer-mode". |
oos_ais_timer | Time since the signaling packet with AIS indicator was received. |
pattern | 4-bit signaling pattern. |
restart | The restart timeout after far-end is OOS. |
rx-idle | The signaling bit pattern indicating that the far end is idle. |
rx-oos | The signaling bit pattern sent to the PBX indicating that the network is OOS. |
standby | The time before the slave side goes back to standby after far-end goes OOS. |
supp_all | The timeout before suppressing transmission of voice and signaling packets to the far-end after detection of PBX OOS. |
supp_voice | The timeout before suppressing transmission of voice packet to the far-end after detection of PBX oos. |
timeout | The timeout for non-receipt of keep-alive packets before the far end is considered to be OOS. |
TRUNK_SC_CONNECT | Trunk conditioning supervisory component status. |
Related Commands
| Command | Description |
show dial-peer voice | Displays the configuration for all VoIP and POTS dial peers configured on the router. |
show voice dsp | Shows the current status of all DSP voice channels. |
show voice port | Displays configuration information about a specific voice port. |
show voice trunk-conditioning signaling | Displays the status of trunk-conditioning signaling and timing parameters for a voice port |
To configure the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks, enter the signal keepalive voice-class configuration command. Enter the no form of this command to restore the default value.
signal keepalive numberSyntax Description
number | Specifies the keepalive signaling packet interval in seconds. The valid range is 1 to 65535. |
Defaults
A keepalive packet is sent every 5 seconds.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring the keepalive signaling interval, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. The voice class must then be assigned to a dial peer.
Examples
The following example, beginning in global configuration mode, sets the keepalive signaling interval to 3 seconds for voice class 10.
router(config)# voice class permanent 10 router(config-class)# signal keepalive 3 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial peer type. |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Configures the signal timing parameter for the idle state of a call. | |
Configures the signal timing parameter for the out-of-service (OOS) state of a call. | |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To define the ABCD bit patterns that identify the idle and out-of-service (OOS) states for Cisco trunks and FRF.11 trunks, enter the signal pattern voice-class configuration command. Enter the no form of this command to remove the signal pattern setting from the voice class.
signal pattern {idle receive | idle transmit | oos receive | oos transmit} bit-patternSyntax Description
idle receive | Defines the signaling pattern for identifying an "idle" message from the network, and Defines the idle signaling pattern to be sent to the PBX if the network trunk is out of service and signal sequence oos idle-only or signal sequence oos both is configured. |
idle transmit | Defines the signaling pattern for identifying an "idle" message from the PBX. |
oos receive | Defines the OOS signaling pattern to be sent to the PBX if the network trunk is out of service and signal sequence oos oos-only or signal sequence oos both is configured. |
oos transmit | Defines the signaling pattern for identifying an OOS message from the PBX. |
bit-pattern | The ABCD bit pattern. Valid values are 0000 to 1111. |
Defaults
idle receive | For near-end E&M—0000 (for T1) or 0001 (for E1) |
idle transmit | For near-end E&M—0000 |
oos receive | For near-end E&M—1111 |
oos transmit | No default signaling pattern is defined. |
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.0(7)XK | Default signaling patterns were defined. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring the signaling pattern, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. After you define the voice class, you will assign it to a dial peer.
Idle Patterns
An idle state is generated if the router detects an idle signaling pattern coming from either direction. If an idle pattern is configured for only one direction (transmit or receive), an idle state can be detected only in the configured direction. Therefore, you should normally enter both the idle receive and the idle transmit keywords.
To suppress voice packets whenever the transmit or receive trunk is in the idle state, use the idle receive and idle transmit keywords in conjunction with the signal timing idle suppress-voice command.
OOS Patterns
An out-of-service (OOS) state is generated differently in each direction.
To suppress voice packets whenever the transmit or receive trunk is in the OOS state, use the oos receive and oos transmit keywords in conjunction with the signal timing oos suppress-voice command.
To suppress voice and signaling packets whenever the transmit or receive trunk is in the OOS state, use the oos receive and oos transmit keywords in conjunction with the signal timing oos suppress-all command.
PBX Busy-Out
To "busy out" a PBX if the network connection fails, set the oos receive pattern to match the seized state (busy), and set the signal timing oos timeout value. When the timeout value expires and no signaling packets have been received, the router will send the oos receive pattern to the PBX.
Use the busy seized pattern only if the PBX does not have a specified pattern for indicating an OOS state. If the PBX has a specific OOS pattern, use that pattern instead.
The following example, beginning in global configuration mode, configures the signaling bit pattern for the idle receive and transmit states:
router(config)# voice class permanent 10
router(config-class)# signal keepalive 3
router(config-class)# signal pattern idle receive 0101
router(config-class)# signal pattern idle transmit 0101
router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
The following example, beginning in global configuration mode, configures the signaling bit pattern for the out-of-service receive and transmit states:
router(config)# voice class permanent 10
router(config-class)# signal keepalive 3
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Specifies the length of time before voice traffic is stopped after a trunk goes into the idle state. | |
Configures the signal timing parameter for the out-of-service (OOS) state of a call. | |
signal timing oos slave-standby | Specifies that a slave port return to its initial standby state after the trunk has been OOS for a specified time |
signal timing oos suppress-all | Configures the router or concentrator to stop sending voice and signaling packets to the network if it detects a transmit OOS signaling pattern from the PBX for a specified time. |
signal timing oos suppress-voice | Configures the router or concentrator to stop sending voice packets to the network if it detects a transmit OOS signaling pattern from the PBX for a specified time. |
signal timing oos timeout | Changes the delay time between the loss of signaling packets from the network and the start time for the OOS state. |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To specify which signaling pattern is sent to the PBX when the far-end keepalive message is lost or AIS is received from the far end, use the signal sequence oos voice-class configuration command. Use the no form of this command to restore the default value.
signal sequence oos {no-action | idle-only | oos-only | both}Syntax Description
no-action | No signaling pattern is sent. |
idle-only | Only the idle signaling pattern is sent. |
oos-only | Only the out-of-service (OOS) signaling pattern is sent. |
both | Both idle and OOS signaling patterns are sent. This is the default value. |
Defaults
Both idle and OOS signal patterns are sent.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
12.0(7)XK | This command was introduced on the Cisco MC3810 series. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series. |
Usage Guidelines
Before configuring the idle or OOS signal patterns to be sent, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. After you finish defining the voice class, you will assign it to a dial peer.
Use the signal sequence oos command to specify which signaling pattern(s) to send. Use the signal pattern idle receive or the signal pattern oos receive command to define the bit patterns of the signaling patterns if other than the defaults.
Examples
The following example, beginning in global configuration mode, defines voice class 10, sets the signal sequence oos to send only the idle signal pattern to the PBX, and applies the voice class configuration to VoFR dial peer 100.
router(config)# voice-class permanent 10 router(config-class)# signal-keepalive 3 router(config-class)# signal sequence oos idle-only router(config-class)# signal timing idle suppress-voice router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10 router(config-dial-peer)# signal-type transparent
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Specifies the length of time before the router stops sending voice packets after a trunk goes into the idle state. | |
Specifies that a permanent voice connection be torn down and restarted after the trunk has been OOS for a specified time. | |
Specifies that a slave port return to its initial standby state after the trunk has been OOS for a specified time | |
Configures the router or concentrator to stop sending voice and signaling packets to the network if it detects a OOS signaling pattern from the PBX for a specified time. | |
Configures the router or concentrator to stop sending voice packets to the network if it detects a transmit OOS signaling pattern from the PBX for a specified time. | |
Changes the delay time between the loss of signaling packets from the network and the start time for the OOS state. | |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To configure the signal timing parameter for the idle state of the call, enter the signal timing idle suppress-voice voice-class configuration command. Enter the no form of this command to restore the default value.
signal timing idle suppress-voice secondsSyntax Description
seconds | Duration of the idle state in seconds before the voice traffic is stopped. The valid range is 0 to 65535. |
Defaults
No signal timing idle suppress-voice timer is configured.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was first introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.0(7)XK | This command was modified to simplify the configuration process. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring the signal timing idle suppress-voice timer, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. The voice class must then be assigned to a dial peer.
The signal timing idle suppress-voice command is used when the signal-type command is set to transparent in the dial peer for the Cisco trunk or FRF.11 trunk connection. The router stops sending voice packets when the timer expires. Signaling packets are still sent.
Examples
The following example, beginning in global configuration mode, sets the signal timing idle suppress-voice timer to 5 for the idle state on voice class 10.
router(config)# voice class permanent 10 router(config-class)# signal keepalive 3
router(config-class)# signal pattern idle receive 0101
router(config-class)# signal pattern idle transmit 0101
router(config-class)# signal timing idle suppress-voice 5 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10 router(config-dial-peer)# signal-type transparent
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial peer type. |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Configures the signal timing parameter for the out-of-service (OOS) state of a call. | |
signal-type | Sets the signaling type to be used when connecting to a dial peer |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To specify that a permanent voice connection be torn down and restarted after the trunk has been out-of-service (OOS) for a specified time, use the signal timing oos restart voice-class configuration command. Use the no form of this command to restore the default value.
signal timing oos restart secondsSyntax Description
seconds | Delay duration in seconds for the restart attempt. There is no default duration. The range is 0 to 65535. |
Defaults
No restart attempt is made if the trunk becomes OOS.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring signal timing OOS parameters, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. You then assign the voice class to a dial peer.
The signal timing oos restart command is valid only if the signal timing oos timeout command is enabled, which controls the start time for the OOS state. The timer for the signal timing oos restart command does not start until the trunk is OOS.
Examples
The following example, beginning in global configuration mode, creates voice class 10, sets the OOS timeout time to 60 seconds and sets the restart time to 30 seconds.
router(config)# voice-class permanent 10 router(config-class)# signal-keepalive 3
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001
router(config-class)# signal timing oos timeout 60 router(config-class)# signal timing oos restart 30 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Configures the signal timing parameter for the idle state of a call. | |
signal-type | Sets the signaling type to be used when connecting to a dial peer |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To configure a slave port to return to its initial standby state after the trunk has been out-of-service (OOS) for a specified time, enter the signal timing oos slave-standby voice-class configuration command. Enter the no form of this command to restore the default value.
signal timing oos slave-standby secondsSyntax Description
slave-standby | If no signaling packets are received for this period, a slave port returns to its initial standby state. |
seconds | Delay duration in seconds before the slave port returns to its standby state. There is no default duration. The range is 0 to 65535 |
Defaults
The slave port does not return to its standby state if the trunk becomes OOS.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring signal timing OOS parameters, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. After you finish defining the voice class, you will assign it to a dial peer.
If no signaling packets are received for the specified delay period, the slave port returns to its initial standby state.
The signal timing oos slave-standby command is valid only if both of the following conditions are true:
Examples
The following example, beginning in global configuration mode, creates a voice port as a slave voice port, creates voice class 10, sets the OOS timeout time to 60 seconds, and sets the return-to-slave-standby time to 120 seconds.
router(config)# voice-port 1/0/0 router(config-voiceport)# connection trunk 5559262 answer-mode router(config-voiceport)# exit router(config)# voice-class permanent 10 router(config-class)# signal-keepalive 3
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001
router(config-class)# signal timing oos timeout 60 router(config-class)# signal timing oos slave-standby 120 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
connection | Specifies a connection mode, such as answer-mode, for a voice port. |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Configures the signal timing parameter for the idle state of a call. | |
signal-type | Sets the signaling type to be used when connecting to a dial peer |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To configure the router or concentrator to stop sending voice and signaling packets to the network if it detects a transmit out-of-service (OOS) signaling pattern from the PBX for a specified time, use the signal timing oos suppress-all voice-class configuration command. Use the no form of this command to restore the default value.
signal timing oos suppress-all secondsSyntax Description
seconds | Delay duration in seconds before packet transmission is stopped. There is no default duration. The range is 0 to 65535. |
Defaults
The router or concentrator does not stop sending packets to the network if it detects a transmit OOS signaling pattern from the PBX.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring signal timing OOS parameters, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. After you finish defining the voice class, you will assign it to a dial peer.
The signal timing oos suppress-all command is valid only if you configure an OOS transmit signaling pattern with the signal pattern oos transmit command. (There is no default oos transmit signaling pattern.)
The signal timing oos suppress-all command is valid whether or not the signal timing oos timeout command is enabled, which controls the start time for the OOS state. The timer for the signal timing oos suppress-all command starts immediately when the OOS transmit signaling pattern is matched.
Examples
The following example, beginning in global configuration mode, creates voice class 10, sets the OOS timeout time to 60 seconds, and sets the packet suppression time to 60 seconds.
router(config)# voice-class permanent 10 router(config-class)# signal-keepalive 3
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001
router(config-class)# signal timing oos timeout 60 router(config-class)# signal timing oos suppress-voice 60 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
signal-type | Sets the signaling type to be used when connecting to a dial peer. |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To configure the router or concentrator to stop sending voice packets to the network if it detects a transmit out-of-service (OOS) signaling pattern from the PBX for a specified time, use the signal timing oos suppress-voice voice-class configuration command. Use the no form of this command to restore the default value.
signal timing oos suppress-voice secondsSyntax Description
seconds | Delay duration in seconds before voice-packet transmission is stopped. There is no default duration. The range is 0 to 65535. |
Defaults
The router or concentrator does not stop sending voice packets to the network if it detects a transmit OOS signaling pattern from the PBX.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring signal timing OOS parameters, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. After you finish defining the voice class, you will assign it to a dial peer.
The signal timing oos suppress-voice command is valid only if you configure an OOS transmit signaling pattern with the signal pattern oos transmit command. (There is no default oos transmit signaling pattern.)
The signal timing oos suppress-voice s command is valid whether or not the signal timing oos timeout command is enabled, which controls the start time for the OOS state. The timer for the signal timing oos suppress-voice command starts immediately when the OOS transmit signaling pattern is matched.
Examples
The following example, beginning in global configuration mode, creates voice class 10, sets the OOS timeout time to 60 seconds, and sets the packet suppression time to 60 seconds.
router(config)# voice-class permanent 10 router(config-class)# signal-keepalive 3
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001
router(config-class)# signal timing oos timeout 60 router(config-class)# signal timing oos suppress-voice 60 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
signal-type | Sets the signaling type to be used when connecting to a dial peer. |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To change the delay time between the loss of signaling packets from the network and the start time for the out-of-service (OOS) state, use the signal timing oos timeout voice-class configuration command. Use the no form of this command to restore the default value.
signal timing oos timeout seconds | disabledSyntax Description
disabled | Deactivates the detection of packet loss. If no signaling packets are received from the network, the router does not sent an OOS pattern to the PBX and it continues sending voice packets to the network. Use this option to disable busyout to the PBX. |
seconds | Delay duration in seconds between the loss of signaling packets and the beginning of the OOS state. The default is 30. The range is 1 to 65535. |
Defaults
No signal timing OOS pattern parameters are configured.
Command Modes
Voice-class configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
Before configuring signal timing OOS parameters, you must use the voice class permanent command in global configuration mode to create a voice class for the Cisco trunk or FRF.11 trunk. After you finish defining the voice class, you will assign it to a dial peer.
You can use the signal timing oos timeout command to enable busyout to the PBX.
The signal timing oos timeout command controls the starting time for the signal timing oos restart and signal timing oos slave-standby commands. If this command is entered with the disabled keyword, the signal timing oos restart and signal timing oos slave-standby commands are ineffective.
Examples
The following example, beginning in global configuration mode, creates voice class 10 and sets the OOS timeout time to 60 seconds.
router(config)# voice-class permanent 10 router(config-class)# signal-keepalive 3
router(config-class)# signal pattern oos receive 0001
router(config-class)# signal pattern oos transmit 0001
router(config-class)# signal timing oos timeout 60 router(config-class)# exit router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
dial-peer voice | Enters dial-peer configuration mode and specifies a dial-peer type. |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
signal-type | Sets the signaling type to be used when connecting to a dial peer. |
Creates a voice class for a Cisco trunk or FRF.11 trunk. | |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To create a voice class for a Cisco trunk or FRF.11 trunk, enter the voice class permanent global configuration command. Enter the no form of this command to delete the voice class.
voice class permanent tagSyntax Description
tag | The unique number you assign to the voice class. The tag number must be unique on the router. The valid range for this tag is 1 to 10000. |
Defaults
No voice class is configured.
Command Modes
Global configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
The voice class permanent command can be used for VoFR, VoATM, and VoIP trunks.
 |
Note The voice class permanent command in global configuration mode is entered without the hyphen. The voice-class permanent command in dial-peer configuration mode is entered with the hyphen. |
Examples
The following example shows how to create a permanent voice class starting from global configuration mode:
router(config)# voice class permanent 10 router(config-class)# signal keepalive 3 router(config-class)# exit router(config)#
Related Commands
| Command | Description |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Configures the signal timing parameter for the idle state of a call. | |
Configures the signal timing parameter for the out-of-service (OOS) state of a call. | |
signal-type | Sets the signaling type for a network dial peer. |
Assigns a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer. |
To assign a previously-configured voice class for a Cisco trunk or FRF.11 trunk to a dial peer, enter the voice-class permanent dial-peer configuration command. Enter the no form of this command to remove the voice-class assignment from the dial peer.
voice-class permanent tagSyntax Description
tag | The unique number assigned to the voice class. The tag number maps to the tag number created using the voice class permanent global configuration command. The valid range for this tag is 1 to 10000. |
Defaults
Dial peers have no voice class assigned.
Command Modes
Dial-peer configuration
Command History
| Release | Modification |
|---|---|
12.0(3)XG | This command was introduced on the Cisco MC3810 series. |
12.0(4)T | This command was implemented in the 12.0(4)T release. |
12.1(3)T | This command was first supported on the Cisco 2600 and 3600 series routers. |
Usage Guidelines
You can assign one voice class to any given dial peer. If you assign another voice class to a dial peer, the last voice class assigned replaces the previous voice class.
|
Note The voice-class permanent command in dial-peer configuration mode is entered with a hyphen. The voice class permanent command in global configuration mode is entered without the hyphen. |
Examples
The following example shows how to assign a previously-configured voice class to a dial peer:
router(config)# dial-peer voice 100 vofr router(config-dial-peer)# voice-class permanent 10
Related Commands
| Command | Description |
Configures the keepalive signaling packet interval for Cisco trunks and FRF.11 trunks. | |
Configures the ABCD bit pattern for Cisco trunks and FRF.11 trunks. | |
Configures the signal timing parameter for the idle state of a call. | |
Configures the signal timing parameter for the out-of-service (OOS) state of a call. | |
signal-type | Sets the signaling type for a network dial peer. |
Creates a voice class for a Cisco trunk or FRF.11 trunk. |
ABCD signaling—Four-bit telephony line signaling coding in which each letter of "ABCD" represents one of the four bits. This is often associated with CAS or Robbed-Bit signaling on a T1 or E1 telephony trunk.
AIS—Alarm Indication Signal.
AVBO—Advanced Voice Busy Out.
Cisco-trunk (private line) call—A Cisco-trunk (private line) call is established by the forced connection of a switched call. A Cisco-trunk call is established during configuration of the trunk and stays up for the duration of the configuration. Optionally, it provides a pass-through connection path to pass signaling information between the two telephony interfaces at either end of the connection.
CLI—Command line interface.
codec—coder-decoder. An integrated circuit device that typically uses pulse code modulation to transform analog signals into a digital bit stream and digital signals back into analog signals. In Voice over IP, Voice over Frame Relay, and Voice over ATM, a DSP software algorithm used to compress/decompress speech or audio signals.
DLCI—Data-link connection identifier.
Dial peer—An addressable call endpoint that contains configuration information including voice protocol, a CODEC type, and a telephone number associated with the call endpoint. There are four kinds of dial peers: POTS, VoIP, VoFR, and VoATM.
DSP—Digital Signaling Processor.
DTMF—Dual tone multifrequency. Uses two simultaneous voice-band tones for dial such as touch tone.
DTMF relay—Enables the generation of FRF.11 Annex A frames for a VoFR or VoIP dial peer.
Switched call—A telephone call dynamically established across a packet data network based on a dialed telephone number. In the case of VoFR, a Cisco proprietary session protocol similar to Q.931 is used to achieve call switching and negotiation between calling endpoints. The proprietary session protocol runs over FRF.11-compliant subchannels.
E&M—Stands for 2-wire or 4-wire interfaces with separate signaling paths (from "Ear and Mouth", also "recEive and transMit"). E&M is a trunking arrangement generally used for two-way switch-to-switch or switch-to-network connections. Cisco's analog E&M interface is an RJ-48 connector that allows connections to PBX trunk lines (tie lines). E&M connections are also available on E1 and T1 digital interfaces.
E1—European equivalent of T1. An E1's 32 channels of 64 kbps bandwidth include one channel for framing and one channel for signaling information. The clock rate is 2.048 MHz.
FRF—Frame Relay Forum. An association of corporate members consisting of vendors, carriers, users, and consultants committed to implementing Frame Relay in accordance with national and international standards. See http://www.frforum.com.
FRF.11—Frame Relay Forum implementation agreement for Voice over Frame Relay (v1.0 May 1997). This specification defines multiplexed data, voice, fax, DTMF digit-relay, and CAS/Robbed-bit signaling frame formats, but does not include call setup, routing or administration facilities. See http://www.frforum.com.
FRF11-trunk—A point-to-point permanent voice connection (private line) conforming to the FRF.11 specification.
FXO—Foreign Exchange Office. An FXO interface connects to the Public Switched Telephone Network (PSTN) or to a station interface on a PBX. Cisco's FXO interface is an RJ-11 connector that allows an analog connection to the PSTN or to a PBX.
FXS—Foreign Exchange Station. An FXS interface connects directly to a standard telephone and supplies ring, voltage, and dial tone. Cisco's FXS interface is an RJ-11 connector that allows connections to basic telephone service equipment, keysets, and PBXs.
ICPIF—Calculated Planning Impairment Factor.
LVBO—Local Voice Busy Out.
MEL CAS—Mercury Exchange Limited (MEL) Channel Associated Signaling. A voice signaling protocol used primarily in the United Kingdom.
OOS—Out of Service state of the call or trunk.
PBX—Private Branch Exchange. A privately owned central switching office.
Permanent calls—Permanent calls are private line calls used for fixed point-to-point calls, connections between PBXs (E&M to E&M), or for remote telephone extensions (FXO to FXS).
POTS—Plain old telephone service. Basic telephone service supplying standard single line telephones, telephone lines, and access to the PSTN.
POTS dial peer—Dial peer connected by a traditional telephony network. POTS peers point to a particular voice port on a voice network device.
PSTN—Public Switched Telephone Network.
RTR—Response Time Reporter.
Switched calls—Switched calls are normal telephone calls when a user picks up a phone, hears a dial tone, and enters the destination phone number to reach the other phone.
T1—Digital carrier facility. T1 transmits DS-1-formatted data at 1.544 Mbps through the telephone-switching network by using AMI or B8ZS coding.
Trunk—Service that allows quasi-transparent connections between two PBXs, a PBX and a local extension, or some other combination of telephony interfaces with signaling passed transparently through the packet data network.
VoFR—Voice over Frame Relay.
VoFR dial peer—Dial peer connected by a Frame Relay network. VoFR peers point to specific VoFR devices.
Voice over Frame Relay—Voice over Frame Relay enables a router to carry voice traffic, for example, telephone calls and faxes, over a Frame Relay network. When sending voice traffic over Frame Relay, the voice traffic is segmented and encapsulated for transit across the Frame Relay network by using FRF.12 encapsulation.
Voice over IP—Voice over IP enables a router to carry voice traffic, for example, telephone calls and faxes, over an IP network. In Voice over IP, the DSP segments the voice signal into frames, which are then coupled in groups and stored in voice packets that are transported by IP.
VoIP—Voice over IP through Ethernet.
Posted: Wed Sep 27 12:48:05 PDT 2000
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