sip_util.c: fix 484 respose to REFER in sip_response_terminates_dialog()

Asterisk (v 1.2.7.1) does response with 484 if a client does send a refer
with a @ReferTo header to an unknown number.  This is therefore not
fundamentally wrong and the dialog should not be destroyed!

darcs-hash:20090115153834-a156d-fc3e550ec73db7199f2bb99e776422e5774c8c7e.gz
parent cbeaccc2
......@@ -1164,14 +1164,25 @@ int sip_response_terminates_dialog(int response_code,
return 0;
case 484: /* Address Incomplete */
case 485: /* Ambiguous */
/** @par 484 Address Incomplete and 485 Ambiguous
Similar to 404 and 410, these
responses came to a request whose Request-URI was provided by the
peer in a @Contact header field. Something has gone fundamentally
wrong, and the dialog and all of its usages are destroyed.
Asterisk (v 1.2.7.1) does response with 484 if a client does send a refer
with a @ReferTo header to an unknown number. This is therefore not
fundamentally wrong and the dialog should not be destroyed!
*/
if (method == sip_method_refer)
{
*return_graceful_terminate_usage = 0;
return 0;
}
case 485: /* Ambiguous */
return terminate_dialog;
case 486: /** @par 486 Busy Here
......
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