Revolabs 10-FLX2-200-VOIP 10-FLX2-020-VOIP 10-FLX2-002-VOIP 10-FLX2-101-VOIP manual SIP Settings

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	Specify the preference for using SIP session keep-alive timers.
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	The expiration period is the interval at which the phone will consider
expiration period	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

58