Packet Voice Processing - Nortel RLC Installation And Administration Manual

RLC description
b. If the RLC calls a remote unit, the remote unit compares its Inbound
For the steps required to configure security level 3 on your RLC, refer to
"Remote connection configuration" on page 197.
Security configuration applies to all ports of a Remote Gateway 9100 Series
unit. That is, all ports on one Remote Gateway 9150 unit have the protection of
the same security level.

Packet voice processing

All connections to the host PBX support the following features:
Voice compression
The RLC supports G.711, G.726, and G.729A voice compression standards. You
can configure different ports with different voice compression algorithms. This
feature allows you to configure different voice QoS for different users.
Note: Remote Gateway 911x units only support G.729A compression in Public
Switched Telephone (PSTN) mode. They support G.711 and G.729A in VoIP
mode.
Voice jitter attenuation buffer
The RLC's dynamic voice jitter attenuation buffer compensates for the uneven
arrival of voice packets at their destinations over a given period of time across
data networks. This buffer collects packets that arrive unevenly and relays them
evenly.
Packet-loss handling techniques
The RLC uses packet-loss handling techniques to accommodate missing packets
or packets that arrive too late to be processed into the real-time voice stream.
Silence suppression algorithm
To save bandwidth, a silence suppression algorithm prevents packet
transmission during periods when Voice Activity Detection (VAD) determines
that there is no voice data present. The receiving end inserts comfort noise to
assure the user that the line is still active.
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security ID with the RLC's Outbound security ID. If they match, the
remote unit accepts the call, otherwise, it rejects the call.
RLC Installation and Administration Guide
Standard 4.0