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SIP Settings
Use the SIP Settings page to configure settings related to SIP sessions, as shown in the
illustration below. After changing any of these settings, the phone must be restarted for
the changes to take effect.
SIP Settings
Use SIP session
timers
Specify the preference for using SIP session keep-alive timers.
During a SIP session, if SIP session timers are active, the SIP User
Agent (UA) periodically sends INVITE or UPDATE requests (also
called refresh requests) to keep the SIP session alive. The interval
and use of the keep-alive is determined at call negotiation. If one of
the UAs in a call does not receive the refresh request within the
expiration timeout period, it will terminate the session.
The available options in FLX are:
Inactive – Session Timers will not be used in any session, except if
explicitly required in the remote request.
Optional – Session Timers will be used in all sessions whenever the
remote supports and uses it.
Required – Session Timers support will be a requirement for the
remote to be able to establish a session.
Always – Session Timers will always be used in all sessions,
regardless of whether or not the remote supports or uses them. This
option is the FLX default.
Session timers
expiration period
The expiration period is the interval at which the phone will consider
the SIP session timed out if it does not receive a refresh message
from the remote phone. It is measured in seconds; the default is
1800. At call negotiation, the nodes will negotiate the expiration