[sr-dev] double record-routing also at outbound edge

[Olle E. Johansson]

29 apr 2013 kl. 09:27 skrev Juha Heinanen <jh at tutpro.com>:

> Olle E. Johansson writes:
> 
>> This was discussed briefly at a SIPit a few years ago. Outbound seems to 
>> focus on session setup, not session management. What happens
>> if a connection goes down and a device re-registers with a new
>> reg-id during a call?
> 
> reg-id does not need to be new.  if ua looses tcp connection to ob proxy
> and sets up a new one, reg-id will not change.  if flow tokens are in
> use in route set, that ua cannot be reached anymore for in-dialog
> requests, which is a bad thing and breaks rfc 3261.  therefore, a
> standards compliant sip proxy cannot be configured to use flow tokens in
> its route uris.

If you have multiple edge proxys, say four, and a device use two of them,
reg-id will change as it registers with number three when number one dies...

But yes, this is something that needs to be looked into.

/O