|
|
This document describes feature changes introduced in Cisco IOS Release 12.0(7)XK for Cisco MC3810 series concentrators that contain high-performance voice compression modules (HCMs).
This document includes the following sections:
High-performance voice compression modules (HCMs) provide voice compression according to the voice compression coding algorithm (codec) specified when the Cisco MC3810 is configured. Table 1 shows the number of voice channels each type of compression module can support.
| Type | Codec Packaging Complexity (see Table 2) | Voice Channels per HCM |
|---|---|---|
HCM2 | High complexity (codec complexity set to high) | 4 |
Medium complexity (codec complexity set to medium) | 8 | |
HCM6 | High complexity (codec complexity set to high) | 12 |
Medium complexity (codec complexity) set to medium: | 24 |
| Codec Packaging | Codecs |
|---|---|
High complexity | G.711ulaw, G.711alaw |
Medium complexity | G.711ulaw, G.711alaw |
HCMs support more voice channels than the earlier voice compression modules (VCMs) used in the Cisco MC3810.
The following restrictions apply to HCMs:
Voice over Internet Protocol (VoIP)
Voice over Frame Relay (VoFR)
Voice over Asynchronous Transfer Mode (VoATM)
This feature is supported on the following platforms:
One or two HCM modules must be installed in your Cisco MC3810.
Complete the following tasks to configure the Cisco MC3810 voice ports for operation with one or two HCMs installed:
To configure codec complexity for voice ports, enter the following commands, beginning in privileged EXEC mode. Commands apply to both analog and digital voice ports unless otherwise indicated. You enter the codec complexity command in voice-card configuration mode. On the Cisco MC3810, voice-card 0 is used as a virtual voice-card, and the setting applies to all voice ports on this Cisco MC3810.
This procedure does not cover other voice-port configuration commands that may be required. To learn more, see Voice, Video, and Home Applications Configuration Guide and Voice, Video, and Home Applications Command Reference for Cisco IOS Release 12.0, and the Cisco MC3810 Multiservice Concentrator Software Configuration Guide.
| Step | Command | Purpose | ||
|---|---|---|---|---|
| router# show voice dsp | Check the DSP voice channel activity. If any DSP voice channels are in the busy state, you cannot change the codec complexity. When all of the DSP channels are in the idle state, continue to step 2. | ||
| router# configure terminal | Enter global configuration mode. | ||
| router(config)# voice-card 0 | Enter voice-card configuration mode and specify voice card 0. Voice card 0 provides the configuration mode for setting the codec complexity on a Cisco MC3810. | ||
| router(config-voicecard)# codec complexity {high | medium}
| Specify the codec complexity for this Cisco MC3810 according to the bandwidth requirements and the number of voice channels to be supported per DSP. The default is medium complexity, which provides four voice channels per DSP. See the "codec complexity" section in the Command Reference for information about the codec complexity command. | ||
| router(config-voicecard)# exit | Exit from voice-card configuration mode. |
To verify the codec complexity configuration, enter the show running-config command to display the current voice-card setting. If medium complexity is specified, the codec complexity setting is not displayed. If high complexity is specified, the setting codec complexity high is displayed. The following example shows an excerpt from the command output if high complexity has been specified:
Router# show running-config . . . hostname router-alpha voice-card 0 codec complexity high . .
Follow these steps to specify a codec for each network dial peer according to the codec complexity setting selected for this Cisco MC3810. If you do not set codec complexity and specify a codec, the defaults remain in effect: medium complexity and G.729, 8000 bps.
This does not cover the complete dial-peer configuration procedure. To learn more, see Voice, Video, and Home Applications Configuration Guide and Voice, Video, and Home Applications Command Reference for Cisco IOS Release 12.0
Follow the procedure below to verify dial-peer configuration. To learn more about these commands, see Voice, Video, and Home Applications Command Reference for Cisco IOS Release 12.0.
Enter the privileged EXEC show dial-peer voice command. The following text is sample output from the show dial-peer voice command for a VoIP dial peer:
Router# show dial-peer voice 10
VoiceOverIpPeer10
information type = voice,
tag = 10, destination-pattern = \Q555....',
answer-address = \Q', preference=0,
group = 10, Admin state is up, Operation state is up,
incoming called-number = \Q', connections/maximum = 0/unlimited,
DTMF Relay = disabled,
application associated:
type = voip, session-target = \Qipv4:10.1.1.1',
technology prefix:
ip precedence = 0, UDP checksum = disabled,
session-protocol = cisco, req-qos = best-effort,
acc-qos = best-effort,
fax-rate = voice, payload size = 20 bytes
codec = g711alaw, payload size = 160 bytes,
Expect factor = 10, Icpif = 30,signaling-type = cas,
VAD = enabled, Poor QOV Trap = disabled,
voice class perm tag = \Q'
Connect Time = 0, Charged Units = 0,
Successful Calls = 0, Failed Calls = 0,
Accepted Calls = 0, Refused Calls = 0,
Last Disconnect Cause is "",
Last Disconnect Text is "",
Last Setup Time = 0.
The following text is sample output from the show dial-peer voice command for a VoFR dial peer:
Router# show dial-peer voice 20
VoiceOverFRPeer20
information type = voice,
tag = 20, destination-pattern = \Q555....',
answer-address = \Q', preference=0,
group = 20, Admin state is up, Operation state is up,
incoming called-number = \Q', connections/maximum = 0/unlimited,
DTMF Relay = disabled,
application associated:
type = vofr, session-target = \QSerial0 120',
called number = \Q',
session-protocol = cisco-switched,
fax-rate = voice, payload size = 30 bytes
codec = g729r8, payload size = 30 bytes,
signaling-type = cas,
VAD = enabled,
Voice Sequence Numbers = disabled,
voice class perm tag = \Q'
Connect Time = 0, Charged Units = 0,
Successful Calls = 0, Failed Calls = 0,
Accepted Calls = 0, Refused Calls = 0,
Last Disconnect Cause is "",
Last Disconnect Text is "",
Last Setup Time = 0.
The following text is sample output from the show dial-peer voice command for a VoATM dial peer:
Router# show dial-peer voice 1
VoiceOverATMPeer1
information type = voice,
tag = 1, destination-pattern = \Q555....',
answer-address = \Q', preference=5,
group = 1, Admin state is up, Operation state is up,
incoming called-number = \Q', connections/maximum = 0/unlimited,
DTMF Relay = disabled,
application associated:
type = voatm, session-target = \QATM0 pvc 101/1001',
session-protocol = cisco-switched,
fax-rate = voice, payload size = 30 bytes
codec = g729r8, payload size = 30 bytes,
signaling-type = cas,
VAD = enabled,
Voice Sequence Numbers = disabled,
voice class perm tag = \Q'
Connect Time = 0, Charged Units = 0,
Successful Calls = 0, Failed Calls = 0,
Accepted Calls = 0, Refused Calls = 0,
Last Disconnect Cause is "",
Last Disconnect Text is "",
Last Setup Time = 0.
This section documents new or modified commands. Modified commands are indicated by an asterisk (*). All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
To specify the voice codec for a network dial peer, enter the codec dial-peer configuration command. Use the no form of this command to restore the default value.
codec codec [bytes payload-size]
codec | Codec options on Cisco MC3810 series equipped with HCM, and with codec complexity set to high or medium:
|
bytes | (Optional) The voice payload for each frame. |
payload-size | (Optional) Number of bytes you specify as the voice payload of each frame. Values depend on the codec type and the packet voice protocol. See Table 3 for valid entries and default values. |
If no codec is specified, dial peers are configured for g729r8 and the voice payload is as shown in Table 3 for G.729r8.
If a codec is specified without the bytes keyword, the voice payload is as shown in Table 3.
Dial-peer configuration
| Release | Modification |
|---|---|
11.3(1)T | This command was introduced as a Cisco 3600 VoIP dial-peer configuration command. |
12.0(4)T | This command was modified for VoFR dial peers. On the Cisco MC3810, this command was first supported as a dial-peer command. |
12.0(5)XK and 12.0(7)T | The g729br8 codec and pre-ietf keyword were added for the Cisco 2600 and 3600 platforms. |
12.0(7)XK | The g729abr8 and g729ar8 codecs were added for the Cisco MC3810 and the keyword pre-ietf was deleted. |
A codec type can be configured on the dial-peer if it is supported under the codec complexity setting you have specified.
The dial-peer configuration command is particularly useful when you must change to a small-bandwidth codec. Large-bandwidth codecs, such as G.711, do not fit in a small-bandwidth link. However, g711alaw and g711ulaw provide higher-quality voice transmission than other codecs. For almost toll quality (and a significant savings in bandwidth), g729r8 provides near-toll quality with considerable bandwidth savings.
If the destination router does not support a codec required by the originating router, the call setup fails.
You can change the payload of each voice packet frame by using the bytes payload-size setting. However, increasing the payload size can add processing delay for each voice packet. Table 3 describes the voice payload options and default values for the codecs and packet voice protocols.
| Codec | Protocol | Voice Payload Options (bytes) | Default Voice Payload (bytes) |
|---|---|---|---|
g711alaw | VoIP | 80, 160 | 160 |
g723ar53 | VoIP | 20 to 220 in multiples of 20 | 20 |
g723ar63 | VoIP | 24 to 216 in multiples of 24 | 24 |
g726r16 | VoIP | 20 to 220 in multiples of 20 | 40 |
g726r24 | VoIP | 30 to 210 in multiples of 30 | 60 |
g726r32 | VoIP | 40 to 200 in multiples of 40 | 80 |
g728 | VoIP | 10 to 230 in multiples of 10 | 40 |
g729abr8 | VoIP | 10 to 230 in multiples of 10 | 20 |
The following example configures VoIP dial peer number 10 to use codec type g723r53 (G.723.1 at 5300 bps), and specifies a non-default voice payload size of 40 bytes:
router(config)#dial-peer voice 10 voiprouter(config-dialpeer)#codec g723r53 bytes 40
| Command | Description |
codec complexity | This voice-card configuration command sets codec complexity and call density. |
show dial-peer voice | Displays the codec setting for dial peers. |
To match the DSP complexity packaging to the codec(s) to be supported, enter the codec complexity voice-card configuration command. The no form of the command restores the default value.
codec complexity {high | medium}
high | With high complexity packaging, each DSP supports two voice channels encoded in any of the following formats: G.711ulaw, G.711alaw, G.723.1(r5.3), G.723.1 Annex A(r5.3), G.723.1(r6.3), G.723.1 Annex A(r6.3), G.726(r16), G.726(r24), G.726(r32), G.729, G.729 Annex B, G.728, and fax relay. |
medium | With medium complexity packaging, each DSP supports four voice channels encoded in any of the following formats: G.711ulaw, G.711alaw, G.726(r16), G.726(r24), G.726(r32), G.729 Annex A, G.729 Annex B with Annex A, and fax relay. This is the default. |
The DSP supports medium complexity codecs.
Voice-card configuration
| Release | Modification |
|---|---|
12.0(5)XK and 12.0(7)T | The command was introduced for the Cisco 2600 and 3600 series. |
12.0(7)XK | This command was first supported on the Cisco MC3810 platform for use with the high performance compression module (HCM). |
Select a higher codec complexity if that is required in order to support a particular codec or combination of codecs.
Select a lower codec complexity to support the greatest number of voice channels, provided that the lower complexity is compatible with the particular codecs in use.
To change codec complexity, all of the DSP voice channels must be in the idle state.
Codec complexity refers to the amount of processing required to perform voice compression. Codec complexity affects the call density---the number of calls that can take place on the digital signal processors (DSPs). With higher codec complexity, fewer calls can be handled.
The following example sets the codec complexity to high on a Cisco MC3810 containing one or two HCMs:
router(config)#voice-card 0router(config-voicecard)#codec complexity high
The following example sets the codec complexity to high on voice card 1 in a Cisco 2600 or 3600 series router:
router(config)#voice-card 1router(config-voicecard)#codec complexity high
| Command | Description |
show voice dsp | Shows the current status of all DSP voice channels. |
To specify the DS0 timeslots that make up a logical voice port on a T1 or E1 controller, and to specify the signaling type, enter the ds0-group controller configuration command. Use the no form of the command to remove the DS0 group and signaling setting.
ds0-group ds0-group-no timeslots timeslot-list type signal-type
ds0-group-no | A number from 0 to 23 (for T1) or from 0 to 30 (for E1) that identifies the DS0 group. |
timeslot-list | timeslot-list can be a single timeslot number, a single range of numbers, or multiple ranges of numbers separated by commas. Allowable values are 1 to 24 for T1 and 1 to 32 for E1. Examples are: · 2 · 1-15, 17-23 · 1-23 · 2, 4, 6-12, 27-32 |
type | The signaling method selection for type depends on the connection that you are making. The E&M interface allows connection for PBX trunk lines (tie lines) and telephone equipment. The FXS interface allows connection of basic telephone equipment and PBXs. The FXO interface is for connecting the central office (CO) to a standard PBX interface where permitted by local regulations; it is often used for off-premises extensions. The following options are available on T1 and E1 controllers: · e&m-immediate-start---no specific off-hook and on-hook signaling · e&m-delay-dial---the originating endpoint sends an off-hook signal and then waits for an off-hook signal followed by an on-hook signal from the destination · e&m-wink-start---the originating endpoint sends an off-hook signal and waits for a wink signal from the destination · fxs-ground-start---Foreign Exchange Station ground-start signaling support · fxs-loop-start ---Foreign Exchange Station loop-start signaling support · fxo-ground-start---Foreign Exchange Office ground-start signaling support · fxo-loop-start---Foreign Exchange Office loop-start signaling support |
| The following options are available only on E1 controllers on the Cisco MC3810: · e&m-melcas-immed---E&M Mercury Exchange Limited Channel Associated Signaling (MELCAS) immediate start signaling support · e&m-melcas-wink---E&M MELCAS wink start signaling support · e&m-melcas-delay---E&M MELCAS delay start signaling support · fxo-melcas---MELCAS Foreign Exchange Office signaling support · fxs-melcas---MELCAS Foreign Exchange Station signaling support |
| The following options are available only when the mode ccs command is enabled on the Cisco MC3810 for transparent CCS support: · ext-sig-master---For the specified channel(s), automatically generates the off-hook signal and stays in the off-hook state · ext-sig-slave---For the specified channel(s), automatically generates the answer signal when a call is terminated to that channel |
No DS0 group is defined.
Controller configuration
| Release | Modification |
|---|---|
11.2 | This command was introduced for the Cisco AS5300 as cas-group. |
12.0(1)T | The cas-group command was first supported on the Cisco 3600 series. |
12.0(5)T | This command was renamed ds0-group on the Cisco AS5300 and on the Cisco 2600 and 3600 series (requires Digital T1 Packet Voice Trunk Network Modules). |
12.0(7)XK | Support for this command was extended to the Cisco MC3810. When the ds0-group command became available on the Cisco MC3810, the voice-group command was removed and no longer supported. |
The ds0-group command automatically creates a logical voice port that is numbered as follows on the Cisco MC3810: slot:ds0-group-no.
On the Cisco MC3810, the slot number is the controller number. Although only one voice port is created for each DS0 group, applicable calls are routed to any channel in the group.
On the Cisco MC3810 when configured for transparent CCS, the channel type configured as the ext-sig-master is considered the master side of the permanent virtual circuit (PVC) connection which is responsible for establishing the PVC connection. After the master channel is configured, a fixed timer of 30 seconds starts. The voice-signaling driver then generates an off-hook signal on the master voice channel after the timer expires. The call is treated as a regular call, and the master channel does not hang up after the connection is made. If the call does not go through, or if the T1/E1 trunk is down, the 30-second timer on the master channel side restarts. A new off-hook signal is then generated at the master channel side after the timer expires.
The following example configures DS0 groups 0 and 1 with different CAS signaling on controller T1 0:
router(config)#controller T1 0router(config-controller)#mode casrouter(config-controller)#framing esfrouter(config-controller)#linecode b8zsrouter(config-controller)#ds0-group 0 timeslot 1-10 type fxs-ground-startrouter(config-controller)#ds0-group 1 timeslot 11-24 type fxo-loop-start
The following example configures DS0 groups 1 and 2 on controller T1 0 to support transparent CCS:
router(config)#controller T1 0router(config-controller)#mode ccs cross-connectrouter(config-controller)#ds0-group 1 timeslot 1-10 type ext-sig-masterrouter(config-controller)#ds0-group 2 timeslot 11-24 type ext-sig-slave
| Command | Description |
Matches the DSP complexity packaging to the codec(s) to be supported. Voice channels in DS0 groups must be in the idle state before codec complexity can be changed. | |
mode ccs | Configures the T1/E1 controller to support CCS cross-connect or CCS frame-forwarding. |
To configure a voice card and enter voice-card configuration mode, enter the voice-card command.
voice-card slot
slot | On the Cisco 2600 and 3600 series: · A number from 0 to 3 that identifies the physical slot in the chassis where the voice card is located. On Cisco MC3810 series concentrators with one or two HCMs installed: · Enter 0 only; this applies to the entire chassis. |
Global configuration
| Release | Modification |
|---|---|
12.0(5)XK and 12.0(7)T | The command was introduced for the Cisco 2600 and 3600 series. |
12.0(7)XK | This command was first supported on the Cisco MC3810 series. |
You can configure codec complexity only in voice-card configuration mode. On the Cisco 2600 and 3600 series routers, the slot corresponds to the physical slot in the chassis. On the Cisco MC3810 series, the slot is always 0, and all changes made in voice-card mode apply to the entire Cisco MC3810. On Cisco MC3810 series concentrators, this command is available only if the chassis is equipped with one or two HCMs.
The following example enters voice-card configuration mode for the voice card in slot 1 on a Cisco 2600 or 3600 router:
router(config)#voice-card 1
router(config-voicecard)#
The following example enters voice-card configuration mode on a Cisco MC3810 concentrator:
router(config)#voice-card 0
router(config-voicecard)#
| Command | Description |
Matches the DSP complexity packaging to the codec(s) to be supported. Codec complexity changes are made in the voice-card configuration mode. |
Posted: Mon Mar 13 09:27:00 PST 2000
Copyright 1989 - 2000©Cisco Systems Inc.