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Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter5 CLI Commands
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.
cnfvbdcodec upspeed-codec
Syntax Description
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 can not be orig in ate d
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 t ab le. AA L1 do es no t suppor t
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.
Note Cisco recommends that you do not use upspeed-codec argument values 5 or 6 with this command.
Examples The following example shows that the VBD upspeed codec is configured as G.711u:
cnfvbdcodec 1
Related Commands
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
Command Description
dspvbdcodec Displays the upspeed codec used for voiceband data (VBD).