2011/4/17 Juha Heinanen <j...@tutpro.com>: > lets say that a sip ua has dialog established with pstn gw and the sip > ua sends refer to pstn gateway for the purpose of transferring the call > to another pstn destination. in that case, referred-by uri is used for > accounting of the new pstn leg.
I've never seen a PSTN gw properly handling a REFER, neither I think a PSTN gw should handle it (but a B2BUA/PBX) between the UA and the PSTN gw(s). The REFER with "Referred-by" headers tells the receipt of such REFER to generate an INVITE with destination indicated in "Refer-To" header and mirroring the "Referred-By" header (so the UAS receiving the INVITE knows that it arrives from user in From header but is a transfer from user in "Referred-By"). Honestly I can imagine how a PSTN gw is supposed to assert the value of "Referred-By". Perhaps it just allows the REFER if it contains a Referred-By matching the From URI header? Cheers. -- Iñaki Baz Castillo <i...@aliax.net> _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
