Datasheet

Configuring Voice Ports
Configuring Digital Voice Ports
VC-63
Cisco IOS Voice, Video, and Fax Configuration Guide
Cisco 2600 and 3600 Series and Cisco MC3810
This procedure applies to voice ports on digital packet voice trunk network modules on
Cisco 2600 series and Cisco 3600 series routers, and to voice ports on HCMs on Cisco MC3810
multiservice concentrators.
Note On Cisco 2600 and 3600 series routers with digital T1/E1 packet voice trunk network modules, codec
complexity cannot be configured if DS0 groups are configured. Use the no ds0-group command to
remove DS0 groups before configuring codec complexity.
Note On the Cisco MC3810 multiservice concentrator with high compression modules, check the DSP
voice channel activity with the show voice dsp command. 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,
you can make changes to the codec complexity selection.
To configure codec complexity, use the following commands beginning in privileged EXEC mode:
Command Purpose
Step 1
Router# show voice dsp
Checks the DSP voice channel activity. If any DSP voice
channels are in the busy state, codec complexity cannot be
changed.
When all of the DSP channels are in the idle state, continue to
Step 2.
Step 2
Router# configure terminal
Enters global configuration mode.
Step 3
Router(config)# voice-card slot
Enters voice card configuration mode for the card or cards in
the slot specified.
For the Cisco 2600 and 3600 series routers, the slot argument
ranges from 0 to 5. For the Cisco MC3810 multiservice
concentrator, slot must be 0.
Step 4
Router(config-voicecard)# codec complexity
{high | med}
Specifies codec complexity based on the codec standard being
used. This setting restricts the codecs available in dial peer
configuration. All voice cards in a router must use the same
codec complexity setting. The keywords are as follows:
• high—(Optional) Specifies up to six voice or fax calls
completed per PVDM-12, using the following codecs:
G.711, G.726, G.729, G.729 Annex B, G.723.1, G.723.1
Annex A, G.728, and fax relay.
• med—(Optional) Supports up to 12 voice or fax calls
completed per PVDM-12, using the following codecs:
G.711, G.726, G.729 Annex A, G.729 Annex B with
Annex A, and fax relay. The default is med.
Note On the Cisco MC3810 multiservice concentrator, this
command is valid only with one or more HCMs
installed, and voice card 0 must be specified. If two
HCMs are installed, this command configures both
HCMs at once.