80System information
2245 repackages the voice data to the correct packet size. The jitter buffer is always configured to 70 ms, and any UNIStim messages that configure the jitter buffer are ignored.
ATTENTION
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
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
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
Release 5.0 15 June 2007
