Grandstream Networks HT502 User Manual page 58

Special Feature Default is Standard. Choose the selection to meet some special requirements
from Softswitch vendors.
Session Expiration Grandstream implemented SIP Session Timer. The session timer extension
enables SIP sessions to be periodically "refreshed" via a SIP request (UPDATE,
or re-INVITE. Once 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.
Min-SE The minimum session expiration (in seconds).
seconds.
Caller Request Timer If selecting "Yes" the phone will use session timer when it makes outbound calls
if remote party supports session timer.
Callee Request Timer If selecting "Yes" the phone will use session timer when it receives inbound calls
with session timer request.
Force Timer 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.
UAC Specify As a Caller, select UAC to use the phone as the refresher, or UAS to use the
Refresher Callee or proxy server as the refresher.
As a Callee, select UAC to use caller or proxy server as the refresher, or UAS
UAS Specify
Refresher to use the phone as the refresher.
Force INVITE Session Timer can be refreshed using INVITE method or UPDATE method.
Select "Yes" to use INVITE method to refresh the session timer.
HT502 User Manual
The default value is 90
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