Rlc System Configuration; Voice Activity Detection - Nortel RLC Installation And Administration Manual

Configuring the RLC

RLC system configuration

There are three categories on the RLC system configuration property sheet:
1. General Configuration – Identify this RLC within your remote network and
address voice quality and signal strength issues at the remote site. In
addition, this category allows you to configure Trunk Support according to
the speed of your connection.
2. CallParrot Feature – The CallParrot Business Call Recording feature is a
TelStrat product. For information on configuring CallParrot functionality,
contact your TelStrat representative.
3. DN Discovery Schedule – Set the times when the RLC automatically
determines the name and number assigned to the all line keys on each RLC
remote port.

Voice Activity Detection

Enable Voice Activity Detection (VAD) to prevent packet transmission during
periods when there is no voice data present. This can help you to save
bandwidth. To enable VAD, click on the Enable option button under Voice
Activity Detection.
If you are having difficulties with voice quality, see if silence suppression has an
effect on the problem by disabling VAD. To disable VAD, click on the Disable
option button under Voice Activity Detection.
Note: When using the bandwidth rules described on the Bandwidth usage table
in the Remote Gateway 9100 Series Network Engineering Guidelines (NTP 555-
8421-103), use the Peak Rate to calculate IP bandwidth overhead if VAD is
disabled. Allocate additional bandwidth over the ISDN for PSTN connections
between the RLC and the Remote Gateway 9150 unit, including QoS transition.
When you enable VAD, the amount of bandwidth allocation is 120% of the
normal rate. Therefore, if you use G.729A, the bandwidth allocation is 9.6K
instead of 8K. If you use G.726, the bandwidth allocation is 38.4K instead of
32K. If the available bandwidth over the PSTN is insufficient, the call is
blocked and you receive a message indicating insufficient bandwidth.
168 RLC Installation and Administration Guide
Standard 4.0