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cnfvbdcodec
cnfvbdcodec
To configure voiceband data (VBD) upspeed codec on the current VISM card, use the cnfvbdcodec
command in the VoIP switching/trunking operating mode.
Syntax Description
upspeed-codec
Command Modes
VoIP switching/trunking
Usage Guidelines
VISM uses the configured codec even if, for example, the configured codec is G.726-32k and VISM is
preconfigured with G.711. In this case, an actual downspeed would be performed.
If you configure clear channel, VISM does support a mixed system clock—VISM cannot be originated
at a T1 line and terminated at an E1 line, or originated at an E1 line and terminated at a T1 line.
When VISM is configured with clear channel, the codec is not used in the fax/modem upspeed session
because VISM cannot detect any tones using clear channel.
AAL2 modes obtain the upspeed codec from the AAL2 profile table. AAL1 does not support
compression and therefore does not require upspeed.
The G.723.1 codecs are supported for VISM-PR cards and are not supported for VISM cards.
Cisco recommends that you do not use upspeed-codec argument values 5 or 6 with this command.
Note
Examples
The following example shows that the VBD upspeed codec is configured as G.711u:
cnfvbdcodec 1
Related Commands
Command
dspvbdcodec
Cisco VISM Installation and Configuration Guide
5-226
cnfvbdcodec upspeed-codec
Upspeed codec. It can be one of the following values:
1 = G.711u (Default for T1 VISM cards)
•
2 = G.711a (Default for E1 VISM cards)
•
3 = G.726-32k
•
4 = Clear channel
•
•
5 = G.723.1-H (Valid for template number 4 only)
•
6 = G.723.1-L (Valid for template number 4 only)
•
7 = G.726-16k
8 = G.726-24k
•
9 = G.726-40k
•
Description
Displays the upspeed codec used for voiceband data (VBD).
Chapter 5
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
CLI Commands
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