[Users] statefull handling of 6xx responses

[Christian Schlatter]

RFC 3261 defines that upon reception of a 6xx response, a proxy SHOULD 
cancel all forked dialogs and send back the 6xx as the final response to 
the upstream UA.

--- rfc 3261, section 16.7 -------
Under the new rules, upon receiving a 6xx, a proxy will issue a CANCEL 
request, which will generally result in 487 responses from all 
outstanding client transactions, and then at that point the 6xx is 
forwarded upstream.
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Some call forking experiments have shown that openser 1.2 does not 
follow these rules, instead it seems to disregard any 6xx response and 
continue with normal processing of existing forked dialogs.

E.g. if a call forks to five phones and one of them sends back a 603 
Declined response, the other four phones continue to ring until 
fr_inv_timer fires and failure_route is called with a status of 408 Timeout.

Is it possible to make openser more SIP RFC compliant through 
configuration or does this need a code change?


thanks,
Christian