Grandstream Networks WP820 Administration Manual page 38

Enable 100rel
Actives PRACK (Provisional Acknowledgment) method. PRACK improves the
network reliability by adding an acknowledgement to the provisional Responses
(1xx). It is set to "Yes", the phone will response to the 1xx response from the
remote party. The default setting is "No".
Session Timer
Enable Session This parameter is to enable/disable session timer function.
Timer
Session Configures the phone's SIP session timer. It enables SIP sessions to be
Expiration(s)
periodically "refreshed" via a SIP request (UPDATE, or re-INVITE). If there is no
refresh via an UPDATE or re-INVITE message, the session will be terminated
once the session interval expires. Session Expiration is the time (in seconds)
where the session is considered timed out, provided no successful session
refresh transaction occurs beforehand. The default setting is 180. The valid range
is from 90 to 64800.
Min-SE (s)
Determines the minimum session expiration timer (in seconds) if the phone act as
a timer refresher. The default setting is 90. The valid range is from 90 to 64800.
UAC Specify
Sets which party will refresh the active session if the phone makes outbound
Refresher calls. If it is set to "UAC" and the remote party does not support Refresher feature,
the phone will refresh the active session. If it is set to "UAS", the remote party will
refresh it. If it is set to "Omit", the header will be omitted so that it can be selected
by the negotiation mechanism. The default setting is "Omit".
UAS Specify
Specifies which party will refresh the active session if the phone receives inbound
Refresher calls. If it is set to "UAC", the remote party will refresh the active session. If it is set
to "UAS" and the remote party does not support refresh feature, the phone will
refresh it. The default setting is "UAC".
Caller Request Timer Sets the caller party to act as refresher by force. If set to "Yes" and both party
support session timers, the phone will enable the session timer feature when it
makes outbound calls. The SIP INVITE will include the content "refresher=uac".
The default setting is "No".
Callee Request
Sets the callee party to act as refresher by force. If set to "Yes" and the both
Timer
parties support session timers, the phone will enable the session timer feature
when it receives inbound calls. The SIP 200 OK will include the content
"refresher=uas". The default setting is "No".
•
If set to "Yes", the phone will configure the related parameters when send
session timer according to "Session Expiration".
•
If set to "No", disables session timer.
WP820 Administration Guide
Version 1.0.1.15
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