Grandstream implemented SIP Session Timer. The session timer extension
enables SIP sessions to be periodically “refreshed” via a SIP request (UPDATE,
or re-INVITE. When the session interval expires, if there is no refresh via a
UPDATE or re-INVITE message, the session will be terminated.
Session Expiration is the time (in seconds) at which the session is considered
timed out, if no successful session refresh transaction occurs beforehand. The
default value is 180 seconds.
The minimum session expiration (in seconds). The default value is 90 seconds.
If selecting “Yes” the phone will use session timer when it makes outbound calls
if remote party supports session timer.
If selecting “Yes” the phone will use session timer when it receives inbound calls
with session timer request.
If selecting “Yes” the phone will use session timer even if the remote party does
not support this feature. Selecting “No” will allow the phone to enable session
timer only when the remote party support this feature.
To turn off Session Timer, select “No” for Caller Request Timer, Callee Request
Timer, and Force Timer.
As a Caller, select UAC to use the phone as the refresher, or UAS to use the
Callee or proxy server as the refresher.
As a Callee, select UAC to use caller or proxy server as the refresher, or UAS to
use the phone as the refresher.
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