Jitter Buffer; Rlr And Slr; Rtcp - Avaya Communication Server 1000 Installation And Commissioning Manual

System information
The jitter buffer is always configured to 70 ms, and any UNIStim messages that configure the
jitter buffer are ignored.
Important:
If the wireless handset is registered to the same LTPS as the IP Phones, configure only the
subset of codecs supported by both the wireless handsets and the IP Phones.
If it is necessary for the IP Phone to use a codec that is not supported on the wireless handsets,
such as G.723.1, the wireless handsets must be configured on their own separate node.
If a remote endpoint is configured for G.723.1 as the Best Bandwidth (BB) Codec and G.711
as the Best Quality (BQ) Codec, (G.729 is not configured), the media path negotiates to G.
711. The result can be unexpected consequences on a narrow-band link.

Jitter buffer

The handsets do not support a configurable jitter buffer. If they receive the Jitter Buffer
Configuration UNIStim message, the command is ignored. The jitter buffer is fixed at 70 ms.
There are two implications of a fixed jitter buffer setting:
• If the system jitter buffer setting is less than 70 ms (default is 50 ms), there is a slightly
longer delay in the IP Phone receive direction.
• If the system jitter buffer setting is longer than 70 ms to accommodate severe network
jitter, there could be slightly higher packet loss in the IP Phone receive direction.
The longer than normal jitter buffer setting is reasonable since extra jitter is introduced by the
RF portion of the link.

RLR and SLR

The handsets do not support UNIStim messages used to adjust the Receive Loudness Rating
(RLR) and Send Loudness Rating (SLR) of the wireless handset.

RTCP

Handsets do not support Real-time Transport Control Protocol (RTCP). Incoming RTCP
packets sent to the wireless handsets are actually sent to the WLAN IP Telephony Manager
2245 and are discarded. If the wireless handset is queried for RTCP parameters, the wireless
handset returns dummy values of 0 jitter, 0 latency, and 0 packet loss.
88 Avaya WLAN IP Telephony Installation and Commissioning November 2010