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The local voice busyout feature for the Cisco MC3810 is designed to busy out the trunks assigned to a PVC whose pipe is broken so that the PBX will not attempt to seize the circuit. This allows the PBX to route or reroute a given call based on the actual availability of trunks.
This feature is not supported on the BRI Voice Module (BVM), which will be available in a future release.
Local voice busyout provides the following benefits:
By marking ports busy, the call is forced back to the originating equipment (typically a PBX), which then reroutes the call over an alternate facility. This ensures that if a link is broken, a caller will not experience a "dead air" state that accompanies a connection that never terminates.
E&M---Stands for recEive and transMit (or Ear and Mouth). 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 is also available on E1 and T1 digital interfaces.
FXO---Foreign Exchange Office. An FXO interface connects to the Public Switched Telephone Network's (PSTN) central office and is the interface offered on a standard telephone. Cisco's FXO interface is an RJ-11 connector that allows an analog connection to be directed at the PSTN's central office or to a station interface on 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 PBXes.
The following restrictions and limitations apply to the Cisco MC3810 local voice busyout implementation:
This feature is supported on the Cisco MC3810 only.
The following configuration tasks should be completed before configuring this feature:
None.
When the network trunk goes down, you need to busy out all the voice ports of the access side to prevent the Cisco MC3810 from accepting new calls from the access side to the network trunk. After the voice ports are placed into the busy out state, the PBX connected to the Cisco MC3810 access side can reroute calls through other trunks.
The Cisco MC3810 will consider a network trunk down when the data link layer control goes down, even if the physical layer is still up.
You can configure a busyout trigger event at both the serial interface level and the voice-port level. If there is a conflict between the interface-level trigger event and the voice-port level trigger event, meaning the trigger events for each are different, the voice-port-level trigger event will overwrite the interface level trigger event.
If more than one interface is configured for a busyout trigger event, voice ports will not be busied out until all of the interfaces are down.
| Step | Command | Purpose | ||
|---|---|---|---|---|
| router(config)# interface serial 0:x | Enter serial interface configuration mode. | ||
| router(config-if)# voice-port busyout | Busy out all voice-ports associated with this serial interface. Note This command busies out all voice ports associated with the interface, except any voice ports configured to busy out under specific conditions, as described in the "Configuring the Voice Port to Busyout Under Specified Conditions" section | ||
| router# show voice busyout | Verify the busyout status. |
When you configure voice-port busyout from a serial network interface, all voice ports are placed into a busyout state when the serial interface goes down.
| Step | Command | Purpose | ||
|---|---|---|---|---|
| router(config)# interface atm 0 | Enter interface configuration mode for the ATM interface. | ||
| router(config-if)# voice-port busyout | Busy out the voice-port associated with the ATM interface. Note This command busies out all voice ports associated with the interface, except any voice ports configured to busy out under specific conditions, as described in the "Configuring the Voice Port to Busyout Under Specified Conditions" section | ||
| router# show voice busyout | Verify the busyout status. |
On voice ports, you can either configure the voice port to busyout under specified conditions, or you can manually force the voice port into a busyout state using the following procedures:
You can specify that for a given voice port, certain conditions will trigger a voice port to enter busyout state. To configure this setting, complete the following steps:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| router(config)# voice-port slot/port | |||
| router(config-voiceport)#
busyout monitor serial {0 | 1}
| 0:0
|
When in monitor mode, if the interface goes down, it triggers a busyout on the voice port. |
You can configure how the voice port will handle the seize conditions (for FXO and FXS voice ports only). To configure the seize conditions, complete the following steps:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| router(config)# voice-port slot/port | |||
| router(config-voiceport)#
busyout seize {ignore | repeat}
| Configure the busyout seize state for the voice port. After you enter this command, you will receive no response or output; however, when you enter the show voice port summary command, the busyout state for the voice port will be shown. |
The busyout seize action depends on the voice port signaling type. For information on the different busyout actions that take place, see Table 1. For E&M voice ports, the busyout action is always seize.
| 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 |
| ||||||||||
FXS Ground Start | Repeat |
| ||||||||||
FXO Loop Start | Default | Close the loop and stay at this state. | ||||||||||
FXO Loop Start | Ignore |
| ||||||||||
FXO Loop Start | Repeat |
| ||||||||||
FXO Ground Start | Default | Ground the tip lead. | ||||||||||
FXO Ground Start | Ignore |
| ||||||||||
FXO Ground Start | Repeat |
| ||||||||||
E&M Immediate Start | Default (only option available) | Seize the far end by setting lead busy. | ||||||||||
E&M Delay Start | Default (only option available) | Seize the far end by setting lead busy. | ||||||||||
E&M Wink Start | Default (only option available) | Seize the far end by setting lead busy. |
To force the voice port into a busyout state, complete the following steps in configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| router(config)# voice-port slot/port | |||
| router(config-voiceport)# busyout forced | Place the voice port into busyout state. | ||
| router# show voice busyout | Verify the busyout status. |
When you perform the previous procedure, the specified voice port is forced into a busyout state when the interface is down. When the busyout forced command is entered, the voice port is forced unconditionally into a busyout state.
When you enter the busyout forced command to a voice port under an interface (such as serial 0:0), when the interface goes down it becomes a condition for the voice port to go down. If more than one interface has the voice-port busyout interface command configured, all interfaces must be down for the busyout to take effect.
When you force the voice port into the busyout state, you must manually force the voice port out of the busyout state by entering the no busyout forced voice-port command.
The following configuration examples configure interface serial local voice busyout The examples also show other commands necessary for the configuration.
The following example configures voice port 1/1 into forced busyout state:
Router(config)# voice-port 1/1
Type of VoicePort is FXS
Router(config-voiceport)# busyout forced
Router(config-voiceport)#
00:09:46: port 0 is forced into 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
The following example configures voice port 1/2 to busyout monitor mode, monitoring serial 0:
Router(config)# voice-port 1/2
Type of VoicePort is FXS
Router(config-voiceport)# busyout-monitor serial 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 voice port 1/3 to the busyout seize repeat state:
Router(config)# voice-port 1/3
Type of VoicePort is FXO
Router(config-voiceport)# busyout-seize repeat
Router(config-voiceport)#
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 new or revised commands are used to configure the local voice busyout feature:
To force the voice port into 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 forcedThis command has no arguments or keywords.
The voice-port is not in busyout state.
Voice-port configuration mode.
This command first appeared in Cisco IOS Release 12.0(3)T.
When you force a voice port into busyout state, you must enter the no busyout forced command to remove the busyout state from the voice port.
The following example configures the voice port on the Cisco MC3810 into forced busyout state:
voice-port 1/1
busyout forced
busyout-monitor
busyout-seize
show voice busyout
voice-port busyout
To place a voice port into busyout monitor state, use the busyout-monitor voice-port configuration command. To remove the busyout monitor state on the voice-port, use the no form of this command.
busyout-monitor interface
interface | · The interface associated with the voice port that will be monitored for events that would trigger a voice-port busyout. Choices are the following: · Serial 0 · Serial 1 · Serial 0:0 |
The voice port is not in busyout monitor state.
Voice-port configuration
This command first appeared in Cisco IOS Release 12.0(3)T.
This command is only supported on the Cisco MC3810.
When you place the voice port in busyout monitor state, the voice port monitors the serial interface for events that would trigger the voice port to enter busyout state
The following example configures the voice port to monitor serial port 0:0 for events that would trigger a busyout state on the voice port:
voice-port 1/1
busyout-monitor serial 0:0
busyout forced
busyout-seize
show voice busyout
voice-port busyout
To change the busyout seize procedure for a voice port, use the busyout-seize voice-port configuration command. To restore the default busyout seize state on the voice-port, use the no form of this command.
busyout-seize {ignore | repeat}
ignore | On busyout, leaves the loop open and ignores the incoming signal. |
repeat | On busyout, seizes the far end and ignores all incoming signals until the far end release. Remove the seize signal, wait for one second before starting to seize the far end again. |
On busyout, the loop is closed and remains in the busyout state.
Voice-port configuration
This command first appeared in Cisco IOS Release 12.0(3)T.
This command is only supported on the Cisco MC3810.
The following example configures the busyout seize to the ignore state:
voice-port 1/1
busyout-seize ignore
busyout forced
busyout-monitor
show voice busyout
voice-port busyout
To display information about the voice busyout state, use the show voice busyout privileged EXEC command.
show voice busyoutThis command has no arguments or keywords.
Privileged EXEC
This command first appeared in Cisco IOS Release 12.0(3)T.
This command is only supported on the Cisco MC3810.
The following example displays the busyout information:
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
busyout forced
busyout-monitor
busyout-seize
voice-port busyout
To place all voice ports associated with a serial or ATM interface into a busyout state, use the voice-port busyout interface configuration command. To remove the busyout state on the voice ports associated with this interface, use the no form of this command.
voice-port busyoutThis command has no arguments or keywords.
The voice port(s) on the interface are not in busyout state.
Interface configuration mode
This command first appeared in Cisco IOS Release 12.0(3)T.
This command is only supported on the Cisco MC3810.
This command busies out all voice port associated with the interface, except any voice ports configured to busy out under specific conditions using the busyout monitor and busyout-seized commands.
The following example turns the voice-port(s) associated with serial interface 1 into busyout state:
interface serial 1
voice-port busyout
The following example turns the voice-port(s) associated with ATM interface 0 into busyout state:
interface atm 0 voice-port busyout
busyout forced
busyout-monitor
busyout-seize
show voice busyout
Posted: Fri Feb 19 14:29:43 PST 1999
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