Configure Used Codec For An H.323 Connection And Enable Fast Connect - Patton electronics SmartNode Series Software Configuration Manual

SmartWare Software Configuration Guide
Configure used codec for an H.323 connection and enable fast connect
The codec used for an H.323 connection could be set in the H.323 gateway as well as in the H.323 interface as
follows. In the H.323 gateway a list of all possible codecs is defined. In the H.323 interface one codec of those
listed in the H.323 gateway must be specified. The actual codec used for the H.323 connection depends on
whether fast connect is used or not as listed in table 21.
With fast connect
1.
2.
3.
Note
Without fast con-
1.
nect
Similarly for an H.323 connection it is possible to specify the packet size of the transmitted voice packets, and
additionally announce length capability for received voice packets to the remote VoIP device.
A regular call setup with H.323 requires about 10 TCP segments or more to be transmitted, because several
parameters are negotiated, for example the codec. Because a normal call setup is often too slow, a fast connect
is possible.
This procedure describes how to configure the used codec on an H.323 connection and enable fast connect
Gateway configuration task list
Table 21. Codec Selection in H.323
A side (outgoing)
If present SmartWare sends codec list in
gateway
If present SmartWare sends codec specified
in interface as first codec (preferred) plus the
codecs specified in the gateway
If present with tag 'exclusive' SmartWare
sends only this codec.
The codecs specified in the inter-
faces must also be present in the
gateway codec list.
SmartWare sends codec list in gateway;
codecs specified in interface (preferred or
exclusive) are without effect.
29 • Gateway configuration
B side (incoming)
SmartWare selects the first codec
1.
from the incoming codec list which
is present in codec list in gateway;
the Session Router then selects the
interface which contains a codec
that matches the selected codec;
the selected codec is used for the
bearer channel.
If no interface matches incoming
2.
codec, SmartWare chooses the
interface with no codec specified;
the selected codec is nevertheless
used for the bearer channel.
If no interface matches incoming
3.
codec an
d if no interface is present
with no codec specified the call is
rejected.
1. SmartWare selects the first codec
from the incoming codec list which
is present in codec list in gateway;
SmartWare chooses interface with
no codec specified.
If no interface is present with no
2.
codec specified the call is rejected.
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