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Table 3-14
Advanced Settings—IP Options
Field or Check Box
Support H.323 Fast Start
in voice-only call setup
(unavailable in
Gateway S40 SP)
Enable packet handling
(may increase call delay)
Network jitter tolerance
Description
The H.323 fast start functionality enables endpoints that
support the feature to join a voice conference in the Gateway
more quickly.
Standard call setup requires four round trips of messages
between endpoints before the first media stream is
exchanged between peers. The set of messages includes
Setup/Connect (Q.931 procedure), Master/Slave
Determination (H.245 procedure), Capability Exchange
(H.245) and Open Logical Channel (H.245).
H.323 fast start shortens the time it takes to start a call by
skipping the H.245 phase and combining the call setup
procedure into a single H.225 transaction.
Select to encapsulate H.245 capabilities exchange and
negotiation messages within Q.931 setup messages.
Select to configure the maximum rate of jitter tolerance in
the Network jitter tolerance field. Jitter occurs when IP
packets sent at a steady rate reach their destination at
different speeds. Streams can also split on their way to the
Gateway between different routers. This can cause a "later"
packet B to arrive before an "earlier" packet A, even though
A was sent before B.
If you selected the Enable packet handling (may increase
call delay) check box, then enter the maximum rate of jitter
tolerate in milliseconds. Packet loss occurs when jitter
exceeds the configured rate.
Configuring the SCOPIA Gateway
Configuring Gateway Settings
115
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