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This document describes enhancements introduced in Cisco IOS Release 12.0(7)XK and supported in Cisco IOS Release 12.1(2)T that add additional busyout functions and extend the cross-platform commonality of the busyout feature between the Cisco 2600 and 3600 series routers and the Cisco MC3810 series concentrators.
This document includes the following sections:
The local voice busyout feature provides a way to busy out a voice port if a monitored network interface changes state. When a monitored interface changes to a specified state---to out-of-service or in-service ---the voice port presents a seized/busyout condition to the attached PBX or other customer premises equipment (CPE). The PBX or other CPE can then attempt to select an alternate route.
Local voice busyout is supported on analog and digital voice ports using channel associated signaling (CAS).
This feature allows you to perform the following tasks:
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Note This feature is different from busy-back, the signal sent from the network to the calling party to indicate a busy (or congested) state along the route. |
These enhancements to the local voice busyout feature provide the following benefits:
The following restrictions and limitations apply to the local voice busyout feature:
This feature is supported on the Cisco MC3810, 2600, and 3600 series.
The following configuration tasks should be completed before configuring this feature:
None.
These procedures do not cover other voice-port configuration commands that may be required. To learn more, see the Cisco IOS Multiservice Applications Configuration Guide and the Cisco IOS Multiservice Applications Command Reference for Cisco IOS Release 12.1.
Complete the following task to configure a voice port to busyout under specified conditions:
Complete the following task to force a voice port into a busyout state:
Complete the following task to specify the busyout seize action for a voice port:
Complete the following task to force a DS0 timeslot into a busyout state:
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Note The Cisco router or concentrator considers a network trunk to be down when the data link layer control goes down, even if the physical layer is still up. |
To configure a voice port to go into the busyout state when one or more interfaces change state, 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 |
| Specify an interface to be monitored by this voice port. To configure a voice port to monitor multiple interfaces, reenter the command for each additional interface to be monitored. The default is to busyout when the monitored interface goes out of service. Enter the keyword in-service to configure the voice port for busyout when the monitored interface comes into service. If a voice port is configured to monitor multiple interfaces for out-of-service states, busyout occurs only when all of the interfaces go out of service. If a voice port is configured to monitor multiple interfaces for the in-service state, busyout occurs when any one interface comes into service. |
To force a voice port into the busyout state, complete the following steps beginning in global configuration mode:
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Note To avoid conflicting CLI commands, do not use this command and the ds0 busyout command on the same controller. |
| 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 | | Place the voice port into the busyout state. If you enter no forced busyout, the voice port busyout state will be controlled by the busyout monitor interface command, if that command is entered. If the busyout monitor interface command has not been entered, the no forced busyout command will force the voice port out of the busyout state. |
Step 3 | | Verify the busyout status. |
(Optional) To configure the seize actions for a busied-out voice port (FXO and FXS voice ports only), 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 |
| (FXO and FXS only) Configure the busyout seize action for this voice port. For information about the various busyout seize actions and the default actions, see the command reference section.
You can use the show voice port command to view the configured busyout seize actions for voice ports. |
To force a DS0 timeslot on a T1 or E1 controller into the busyout state, complete the following steps beginning in global configuration mode:
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Note To avoid conflicting CLI commands, do not use this command and the busyout forced command on the same controller. |
| Command | Purpose | |
|---|---|---|
Step 1 | router(config)# controller {t1 | e1} {0 | 1}
| Identify the controller you want to configure and enter controller configuration mode. |
Step 2 | | Place one or more DS0 timeslots into the busyout state. |
The following example forces analog voice port 1/1 on a Cisco MC3810 series concentrator into the busyout state:
Router(config)# voice-port 1/1 Type of VoicePort is FXS Router(config-voiceport)# busyout forced Router(config-voiceport)# end Router# show voice busyout If following network interfaces are down, voice port will be put into busyout state The following voice ports are in busyout state
1/1 is forced into busyout state
The following example configures digital voice port 0:0.4 on a Cisco MC3810 series concentrator to go into the busyout state if serial interface 0:0 goes out of service:
Router(config)# voice-port 0:0.4 Type of VoicePort is FXS Router(config-voiceport)# busyout monitor interface serial 0:0 1/2 is in busyout state Router(config-voiceport)# end Router# show voice busyout If following network interfaces are down, voice port will be put into busyout state The following voice ports are in busyout state 1/1 is forced into busyout state 1/2 is in busyout state caused by Serial0
The following example configures digital voice port 2/1:7 on a Cisco 3600 series router to go into the busyout state if serial interface 0:0 goes out of service:
Router(config)# voice-port 2/1:7 Type of VoicePort is FXS Router(config-voiceport)# busyout monitor interface serial 0:0 1/2 is in busyout state Router(config-voiceport)# end Router# show voice busyout If following network interfaces are down, voice port will be put into busyout state The following voice ports are in busyout state 2/1:7 is forced into busyout state 2/1:8 is in busyout state caused by Serial0
The following example configures the busyout seize action for analog voice port 0/2/1 on a Cisco 3600 series router to repeat:
Router(config)# voice-port 0/2/1 Type of VoicePort is FXO Router(config-voiceport)# busyout seize repeat Router(config-voiceport)# end Router# show voice busyout If following network interfaces are down, voice port will be put into busyout state The following voice ports are in busyout state 0/2/1 is forced into busyout state 0/2/2 is in busyout state caused by Serial0
The following example forces DS0 timeslots 1 through 12 on controller T1 0 on a Cisco MC3810 series concentrator into the busyout state:
Router(config)# controller t1 0 Router(config-controller)# ds0 busyout 1-12 Router(config-controller)# end
You can use the show running configuration command to determine which DS0 timeslots have been forced into the busyout state.
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 12.1 command references.
To force a voice port into the busyout state, use the busyout forced voice-port configuration command. To remove the voice port from busyout state, use the no form of this command.
busyout forcedSyntax Description
This command has no arguments or keywords.
Defaults
The voice-port is not in the busyout state.
Command Modes
Voice-port configuration.
Command History
| Release | Modification |
|---|---|
12.0(3)T | This command was introduced on the Cisco MC3810 series. |
12.0(7)XK | This command was first supported on the Cisco 2600 and 3600 series routers. On the Cisco MC3810 series, the voice-port busyout command was eliminated in favor of this command. |
12.1(2)T | This command was implemented in the 12.1(2)T release. |
Usage Guidelines
If a voice port is in the forced busyout state, only the no busyout forced command can restore the voice port to service.
To avoid conflicting CLI commands, do not use the busyout forced command and the ds0 busyout command on the same controller.
Examples
The following example forces analog voice port 1/1 on a Cisco MC3810 into the busyout state:
router(config)# voice-port 1/1
router(config-voiceport)# busyout forced
The following example forces digital voice port 0:8 on a Cisco MC3810 into the busyout state:
router(config)# voice-port 0:8
router(config-voiceport)# busyout forced
The following example forces analog voice port 3/1/1 on a Cisco 3600 into the busyout state:
router(config)# voice-port 3/1/1
router(config-voiceport)# busyout forced
The following example forces digital voice port 0/0:12 on a Cisco 3600 into the busyout state:
router(config)# voice-port 0/0:12
router(config-voiceport)# busyout forced
Related Commands
| Command | Description |
Configures a voice port to monitor a serial interface for events that would trigger a voice-port busyout. | |
Changes the busyout seize procedure for a voice port. | |
Displays information about the voice busyout state. |
To configure a voice port to monitor an interface for events that would trigger a voice-port busyout, use the busyout monitor interface voice-port configuration command. To configure a voice port not to monitor an interface for such events, use the no form of this command.
busyout monitor interface {serial interface-number | ethernet interface-number} [in-service]Syntax Description
serial | Specifies monitoring of a serial interface.
| ||
ethernet | Specifies monitoring of an ethernet interface.
| ||
interface-number | Identifies an interface to be monitored for the voice-port busyout function. Interface choices include serial port, serial port subinterface, Ethernet port, and ATM interface. | ||
in-service | (Optional) Configures the voice port to be busied out when any monitored interface comes into service (state changes to up). If the keyword is not entered, the voice port is busied out when all monitored interfaces go out of service (state changes to down). |
Defaults
The voice port does not monitor any interfaces.
Command Modes
Voice-port configuration
Command History
| Release | Modification |
|---|---|
12.0(3)T | This command was introduced on the Cisco MC3810 series. |
12.0(7)XK | This command was first supported on the Cisco 2600 and 3600 series routers, and the ability to monitor an Ethernet port was introduced. |
12.1(2)T | This command was implemented in the 12.1(2)T release. |
Usage Guidelines
A voice port can monitor multiple interfaces at the same time. To configure a voice port to monitor multiple interfaces, reenter the busyout monitor interface command for each additional interface to be monitored.
You can combine in-service and out-of-service monitoring on a voice port. The following rule describes the actions if monitored interfaces change state:
A voice port is busied out if:
a. Any interface monitored for coming into service comes up
b. All interfaces monitored for going out of service go down
Examples
The following example configures analog voice port 1/1 on a Cisco MC3810 to busyout if serial ports 1 and 0:0 both go out of service:
router(config)# voice-port 1/1router(config-voiceport)#busyout monitor interface serial 0:0router(config-voiceport)#busyout monitor interface serial 1
The following example configures analog voice port 1/2 on a Cisco MC3810 to busyout if serial port 0 comes into service:
router(config)# voice-port 1/2
router(config-voiceport)# busyout monitor interface serial 0 in-service
The following example configures digital voice port 1/2/2 on a Cisco 3600 to busyout if serial port 0 goes out of service:
router(config)# voice-port 1/2/2router(config-voiceport)#busyout monitor interface serial 0
The following example configures digital voice port 0:6 on a Cisco MC3810 to busyout if Ethernet port 0 goes out of service:
router(config)# voice-port 0:6
router(config-voiceport)# busyout monitor interface ethernet 0
Related Commands
| Command | Description |
Forces a voice port into the busyout state. | |
Changes the busyout seize procedure for a voice port. | |
Displays information about the voice busyout state. |
To change the busyout action for an FXO or FXS voice port, use the busyout seize voice-port configuration command. To restore the default busyout action, use the no form of this command.
busyout seize {ignore | repeat}Syntax Description
ignore | See Table 1 for the ignore actions for different voice ports and signaling types. |
repeat | See Table 1 for the repeat actions for different voice ports and signaling types. |
Defaults
See Table 1 for the default actions for different voice ports and signaling types.
Command Modes
Voice-port configuration
Command History
| Release | Modification |
|---|---|
12.0(3)T | This command was introduced on the Cisco MC3810 series. |
12.0(7)XK | This command was first supported on the Cisco 2600 and 3600 series. |
12.1(2)T | This command was implemented in the 12.1(2)T release. |
Usage Guidelines
The busyout seize command is valid for both analog and digital voice ports. On digital voice ports, the busyout actions are valid whether the busyout results from a voice-port busyout event or from the ds0-busyout command.
The voice port returns to an idle state when the event that triggered the busyout disappears.
Table 1 describes the busyout actions for the busyout seize settings on each voice port type.
The busyout action for E&M voice ports is to seize the far end by setting lead busy.
| Voice-Port Signaling Type | Procedure Setting (busyout-option command) | Busy Out Actions |
|---|---|---|
FXS Loop Start | Default | Remove the power from the loop. For analog voice ports, this is equivalent to removing the ground from the tip lead. For digital voice ports, the port will generate the bit pattern equivalent to removing the ground from the tip lead, or will busy out if the bit pattern exists. |
FXS Loop Start | Ignore | Ignore the ground on the ring lead. |
FXS Ground Start | Default | Ground the tip lead and stay at this state. |
FXS Ground Start | Ignore | 1. Leave the tip lead open. 2. Ignore the ground on the ring lead. |
FXS Ground Start | Repeat | 1. Ground the tip lead. 2. Wait for the far end to close the loop. 3. The far end closes the loop. 4. If the far end then opens the loop, FXS removes the ground from the tip lead. 5. FXS waits for several seconds before returning to Step 1. |
FXO Loop Start | Default | Close the loop and stay at this state. |
FXO Loop Start | Ignore | 1. Leave the loop open. 2. Ignore the ringing current on the ring level. |
FXO Loop Start | Repeat | 1. Close the loop. 2. After the detected far end starts the power denial procedure, FXO opens the loop. 3. After the detected far end has completed the power denial procedure, FXO waits for several seconds before returning to Step 1. |
FXO Ground Start | Default | Ground the tip lead. |
FXO Ground Start | Ignore | 1. Leave the loop open. 2. Ignore the running current on the ring lead, or ground on the tip lead. |
FXO Ground Start | Repeat | 1. Ground the ring lead. 2. Remove the ground from the ring lead, and close the loop after the detected far end grounds the tip lead. 3. When the detected far end removes the ground from tip lead, FXO opens the loop. 4. FXO waits for several seconds before returning to Step 1. |
Examples
The following example configures analog voice port 1/1 to perform the "ignore" actions when busied out:
router(config)# voice-port 1/1
router(config-voiceport)# busyout seize ignore
The following example configures digital voice port 0:2 to perform the "repeat" actions when busied out:
router(config)# voice-port 0:2
router(config-voiceport)# busyout seize repeat
Related Commands
| Command | Description |
Forces a voice port into the busyout state. | |
Configures a voice port to monitor an interface for events that would trigger a voice-port busyout. | |
Forces a DS0 timeslot on a controller into the busyout state. | |
Displays information about the voice busyout state. |
To force a DS0 timeslot on a controller into the busyout state, use the ds0 busyout controller configuration command. To remove the DS0 timeslot from the busyout state, use the no form of this command.
ds0 busyout ds0-timeslotSyntax Description
ds0-timeslot | DS0 timeslot(s) to be forced into the busyout state. The range is 1 to 24 and can include any combination of timeslots. |
Defaults
DS0 timeslots are not in busyout state.
Command Modes
Controller configuration.
Command History
| Release | Modification |
|---|---|
12.0(7)XK | This command was introduced on Cisco MC3810 series concentrators and Cisco 2600 and 3600 series routers. |
12.1(2)T | This command was implemented in the 12.1(2)T release. |
Usage Guidelines
The ds0 busyout command affects only DS0 timeslots that are configured into a DS0 group and function as part of a digital voice port. If multiple DS0 groups are configured on a controller, you can busy out any combination of DS0 timeslots, provided that each DS0 timeslot to be busied out is part of a DS0 group.
If a DS0 timeslot is in the busyout state, only the no ds0 busyout command can restore the DS0 timeslot to service.
To avoid conflicting CLI commands, do not use the ds0 busyout command and the busyout forced command on the same controller.
Examples
The following example forces DS0 timeslot 6 on controller T1 0 into the busyout state:
router(config)# controller t1 0router(config-controller)#ds0 busyout 6
The following example forces DS0 timeslots 1, 3, 4, 5, 6, and 24 on controller E1 1 into the busyout state:
router(config)# controller e1 1router(config-controller)#ds0 busyout 1,3-6,24
Related Commands
| Command | Description |
Changes the busyout seize procedure for a voice port. | |
show running configuration | You can use this command to determine which DS0 timeslots have been forced into the busyout state. |
To display information about the voice busyout state, use the show voice busyout privileged EXEC command.
show voice busyoutSyntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
| Release | Modification |
|---|---|
12.0(3)T | This command was introduced on the Cisco MC3810 series. |
12.0(7)XK | This command was first supported on the Cisco 2600 and 3600 series. |
12.1(2)T | This command was implemented in the 12.1(2)T release. |
Usage Guidelines
The show voice busyout command lists the following information:
Examples
The following example displays the busyout information:
router# show voice busyout If following network interfaces are down, voice port will be put into busyout state
ATM0
Serial0
The following voice ports are in busyout state
1/1 is forced into busyout state
1/2 is in busyout state caused by network interfaces
1/3 is in busyout state caused by ATM0
1/4 is in busyout state caused by network interfaces
1/5 is in busyout state caused by Serial0
Related Commands
| Command | Description |
Forces a voice port into the busyout state. | |
Configures a voice port to monitor an interface for events that would trigger a voice-port busyout. |
Posted: Fri Jun 16 15:07:57 PDT 2000
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