[SR-Users] dialog: use keepalive & timeout features together

[Andrey Utkin]

Would be nice if it would be possible to
- make timer of "default_timeout" reset to 0 when keep-alive reply is
received from remote part of call leg, so that the timeout expires
(triggering call termination) only if some call party gets offline (we
don't want just to limit the duration of normal call, even if call
parties don't send any new SIP requests);
OR
- make unresponsiveness of call parties to keep-alive messages
(controlled with ka_timer, ka_interval parameters) lead to some
action, like call termination.

Please advise if I miss something, and how to implement this better.
Thanks in advance.

-- 
Andrey Utkin