Enable
Session
Timer
Allows the phone system to use the session timer, when set to “Yes”, it will be added in the SIP INVITE
message to notify the server.
Session
Expiration
(s)
Configures the phone system’s SIP session timer. It enables SIP sessions to be 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
Refresher
Sets which party will refresh the active session if the phone makes outbound calls. If it is set to “UAC” and the
remote party does not support Refresher feature, the phone system 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
Refresher
Specifies which party will refresh the active session if the phone receives inbound 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 system 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
Timer
Sets the callee party to act as refresher by force. If set to “Yes” and the both 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”.
Force
Timer
Configures the session timer feature on the phone system by force.
If it is set to “Yes”, the phone will use the session timer even if the remote party does not support this
feature.
If set to “No”, the phone will enable the session timer only when the remote party supports this feature. To
turn off the session timer, select “No”.
The default setting is “No”.
Force
INVITE
Sets the SIP message type for refresh the session. If it is set to “Yes”, the Session Timer will be refreshed by
using the SIP INVITE message. Otherwise, the phone system will use the SIP UPDATE or SIP OPTIONS
message. Default is “No”.
Table 9: Account/SIP Settings
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