[OpenSER-Users] Unregister a user when not responding to SIP pings

[Juha Heinanen]

Iñaki Baz Castillo writes:

 > But in that case your SIP client would register again, wouldn't it?

sip phone has not noticed that underlying ip connectivity over some
wireless media is lost for the period the train is in tunnel unless it
tries to register at the same time.

 > If you are in a escenary with easy connection lost then is user task to set 
 > the REGISTER period shorter.

no sip specification today mandates or even recommends setting register
period short if there is possibility for temporary loss of connectivity.
dropping of registration if contact does not respond would thus cause
problems.

-- juha