User's Manual

Page 382 of 910 Configuration of IP Telephony nodes using Element Manager
553-3001-365 Standard 4.00 August 2005
Figure 89
Codec list
Note: The codec list contains four codec settings for G.711, G.729A,
C.723.1, and T.38 FAX for the Voice Gateway Media Card.
3 The G.711, G711 Clear Channel, and T.38 FAX codecs are selected by
default, and these selections cannot be cleared. However, the following
changes can be made:
• The payload size, jitter buffer setting, and companding law for the
G.711 codec can be changed. The default is G.711 mu-law.
• Only the jitter buffer can be changed for the G.711 Clear Channel
codec.
Up to three additional codecs can be optionally selected: G.729A,
G.729AB, and/or G.723.1 codecs.
• If the G.729A or G.729AB codec are selected, the payload and jitter
buffer can be changed. The payload defaults are the maximum
supported payload.
• If the G.723.1 codec is selected, only the jitter buffer can be changed.
The payload size of 30 msec is the only supported payload.
Note: The supported G.723.1 codec has bit rates of 5.3 Kbps and
6.3 Kbps.