Configuring Jitter - Cisco Voice Interworking Services (VISM) Installation And Configuration Manual

Configuring VISM Features
Type the cnferl command, the echo-ret-loss argument value, and press Enter to specify the ECAN
Step 4
algorithm's return echo loss applied by ECAN DSPs, in decibels. Specify the echo-ret-loss argument
with one of the following values:
•
Type the cnfconvbdpol command, lcn, carrier-loss-pol, and cac-reject-pol argument values, and press
Step 5
Enter to specify the fax/modem upspeed connection admission control (CAC) failure and carrier loss
policies for a channel. Specify the arguments with the following values:
•
•
•
You have completed enabling and configuring ECAN on your lines. Proceed to the
section on page

Configuring Jitter

You can dejitter the voice payload to improve the quality of the egress voice stream.
Note If your application uses the AAL2 trunking operation mode, you cannot change the jitter parameters
while the CIDs are active.
Complete the following steps to specify and configure jitter mode:
Type the cnfjtrmode command, the jitter-mode argument value, and press Enter to set the jitter mode.
Step 1
Specify the jitter-mode argument with one of the following values:
•
•
If you chose a fixed buffer size in
Step 2
"Configuring the ATM Network Side" section on page
Step
Cisco VISM Installation and Configuration Guide
4-30
echo-ret-loss:
1 = 0 dB
–
2 = 3 dB
–
3 = 6 dB
–
– 4 = 1 dB
lcn (logical channel number): In the range from 131 to 510.
carrier-loss-pol (carrier loss policy):
– 1 = Revert to the previous codec
– 2 = Maintain the upspeed codec
– 3 = Unspecified
cac-reject-pol (CAC rejection policy):
1 = Delete the connection
–
2 = Maintain the connection
–
3 = Unspecified
–
4-30.
1 = Fixed buffer size; recommended value if the jitter amount is expected to be constant or near
constant.
2 = Adaptive; you specify a starting buffer size and VISM adapts the buffer size to handle jitter.
1, proceed to Step 3.
Step 1, you have completed configuring jitter. Proceed to the
4-31. If you chose an adaptive buffer size in
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter 4 Configuring VISM Features
"Configuring Jitter"