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Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter 5 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 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.
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).