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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
cnfjtrinitdelay
cnfjtrinitdelay
To configure the initial jitter buffer delay size, use the cnfjtrinitdelay command in the VoIP
switching/trunking, switched AAL2 PVC, and AAL2 trunking operating mode.
cnfjtrinitdelay jitter-buffer-size
Syntax Description
Command Modes VoIP switching/trunking, switched AAL2 PVC, and AAL2 trunking
Usage Guidelines Determine the current jitter delay mode you configured with the cnfjtrmode command. If the mode is
set to fixed (set by the command) the jitter buffer size is fixed at the value you indicate for the
jitter-buffer-size argument for the duration of the call. If the mode is set to adaptive, the jitter buffer size
is set initially to the value you indicate for the jitter-buffer-size argument and the digital signal processor
(DSP) adapts the jitter buffer size to an optimal size.
Changing the jitter-buffer-size argument value does not affect existing channel identifiers (CIDs). The
new value is sent to the DSPs only when CIDs are open.
Table 5-2 lists the default codec type initial delay values in milliseconds.
jitter-buffer-size Jitter buffer size setting (defined in milliseconds). It can be a value from one of
the following ranges:
• For template numbers 1, 3, and 4, in the range from 0 to 100 in increments
of 10.
• For template number 2, in the range from 0 to 100 in increments of 5.
Table 5-2 Codec Type Default Values
Codec Type Delay Mode Initial Delay (ms)
G.711u Fixed 100
G.711a Fixed 100
G.726-32k Adaptive 60
G.729a Adaptive 60
G.729ab Adaptive 60
Clear channel Fixed 100
G.726-16k Adaptive 60
G.726-24k Adaptive 60
G.726-40k Adaptive 60
G.723.1-H
1
G.723.1a-H
1
G.723.1-L
1
G.723.1a-L
1