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Configuring Voice Ports

Release 12.0(7)XK

Validation Tips

You can check the validity of your voice-port conﬁguration by performing the following tasks:

• Pick up the handset of an attached telephony device and check for dial tone.

• If you have dial tone, check for DTMF detection. If the dial tone stops when you dial a digit, the

voice port is most likely conﬁgured properly.

• Use the show voice port or show voice port summary command to view the voice-port

conﬁguration.

• Use the show voice dsp command to view the current status of all DSP voice channels.

• Use the show voice call summary command to view the call status for all voice ports.

Troubleshooting Tips

If you are havingtrouble connecting a call and you suspect the problem is associated with voice-port

conﬁguration, you can try to resolve the problem by performing the following tasks:

• Ping the associated IP address to conﬁrm connectivity. If you cannot successfully ping your

destination, refer to the Network Protocols Conﬁguration Guide, Part 1.

• Use the show voice port command to make sure that the port is enabled. If the port is ofﬂine,

enter the no shutdown command.

• Check to see if the analog personality module is correctly installed. For more information, refer

to the hardware installation guide for your router or concentrator.

router(config-voice-port)#compand-type {u-law |

a-law}

Conﬁgure the companding standard used to convert between

analog and digital signals in PCM systems. Defaults are: u-law

for T1; a-law for E1.

router(config-voice-port)#vad

(Optional) Enable voice activity detection (VAD).

router(config-voice-port)#comfort-noise

(Optional) Enable background noise if VAD is enabled.

router(config-voice-port)#music-threshold

number

(Optional) Specify the maximum volume (in dBm) for on-hold

music. Valid entries are –70 to –30.

router(config-voice-port)#description

string

(Optional) Describe the location, connected equipment, or other

information about the voice port. The description is displayed

when a show command is entered.

router(config-voice-port)#exit

Exit from voice-port 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.

Note You cannot change codec complexity while DS0 groups

are deﬁned. If they are already set up, use the no ds0-group

command before resetting the codec complexity.

router(config-voice-ca)#exit

Exit from voice-card conﬁguration mode.

router(config-voice-port)#exit

Exit from voice-port conﬁguration mode.

Step Command Purpose

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Cisco MC3810 Guía de instalación Pagina 18

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