IPX-100 system installation & configuration
Page-41
TELECOMMUNICATIONS
3-3-4
RTP Options
At this page to set the basic operating parameters of the PBX program to process RTP packet
transmission
：
Timeout of NO RTP
When the call does not enter the HOLD state, if there is no
RTP packet received or the RTCP action stops, the system does
not resume any time, and the system immediately ends the
call automatically (such as power failure, network
disconnection, etc.).
Timeout of NO RTP on HOLD
When the call enters the HOLD state, if there is no RTP packet
received or the RTCP action stops, the system does not
resume any time, and the system immediately ends the call
automatically (this time must be longer than Timeout of NO
RTP).
Send Keepalives in the RTP Stream Send a keep alives message in the RTP packet stream to keep
the currently used NAT channel still open.
Session Timers
The SIP session counter provides a Keep-alive mechanism for
the ongoing session. It can detect and correct SIP channels
that are not terminated by normal signaling procedures.
Originate
Always make a request and execute a session
counter.
Accept
The session counter (system default) is executed
when another UA device makes a request.
Refuse
Don't run session counters on any call.
Maximum Session Refresh Interval Maximum session refresh interval, in seconds, preset to 1800
seconds.
Minimum Session Refresh Interval
Minimum session refresh interval, in seconds, preset to 90
seconds.
Session Refresher
Session refresh executor (uac or uas), defaulted to "uas"
UAS
As much as possible, the caller should be
refreshed (system default).
UAC
As much as possible, it is preset to be refreshed
by the called party.
Please note: Due to the recommendations in RFC 4028, PBX programs will always follow the
preferences of other terminals for processing refreshes. PBX programs never override
the preferences of other terminals. Because doing so may cause the PBX program and
the terminal to compete for who sent the refresh. This applies to the start of the
session timer and subsequent Re-INVITE requests, whether the PBX program is a
caller or a callee, or is currently being refreshed by a PBX program.
