I had the same issue, but with the client behind NAT. The problem wasn't the Via, it was on one hand the x-route-tag="tgrp:E\d+-\d+" I had to strip away, because the GS didn't like it. And on the other hand Cisco acts as a strict router, adding another Route header field at the end, which was not stripped by OS, and if that was a private IP address, the ACK never reaches the GS phone. hopefully that helps. br Walter _____ From: users-bounces(a)openser.org [mailto:users-bounces@openser.org] On Behalf Of Dioris Moreno Sent: Wednesday, May 10, 2006 5:26 PM To: users(a)openser.org Subject: [Users] Comma-Separated Via Header I was making some fax tests using a Cisco AS5300, OpenSER 1.0.1 and a Grandstream HandyTone 486. Everything results fine when I previously make the same test directly from the HandyTone to the AS5300, however when I put OpenSER in the middle the fax connection could not be established. Checking captures at both ends, I noticed the HandyTone was not receiving the OK response to its RE-INVITE request, but the AS5300 was sending it. Looking a capture in the OpenSER, I suppose it didn't send the OK response from the AS5300 to the HandyTone because the format of the Via Header used by the AS5300. Look at the captures below, the AS5300 sends the Via header in a comma-separated format instead using a line for each one. Is there a way to workaround this? I think my best option is to modify the OpenSER code to support both formats. Is this something that somebody already does it? If the answer it is not, where can I start? I'll appreciate any help. Dioris Moreno Cisco AS5300 IP Address: AAA.BBB.CCC.DDD OpenSER IP Address: WWW.XXX.YYY.ZZZ Grandstream HT486 IP Address: FFF.GGG.HHH.III Calling Party Number (PSTN): UserA Called Party Number (VoIP): UserB Message From OpenSER to Cisco AS5300 Session Initiation Protocol Request-Line: INVITE sip:UserA@AAA.BBB.CCC.DDD:5060 SIP/2.0 Method: INVITE Resent Packet: False Message Header Record-Route: <sip:WWW.XXX.YYY.ZZZ;ftag=266f5f157860b9ca;lr=on> Via: SIP/2.0/UDP WWW.XXX.YYY.ZZZ;branch=z9hG4bK6a82.677fb8e1.0 Via: SIP/2.0/UDP FFF.GGG.HHH.III:50841;branch=z9hG4bK90436408698e6881 From: <sip:UserB@WWW.XXX.YYY.ZZZ>;tag=266f5f157860b9ca SIP from address: sip:UserB@WWW.XXX.YYY.ZZZ SIP tag: 266f5f157860b9ca To: <sip:UserA@AAA.BBB.CCC.DDD>;tag=D33F86B0-94F SIP to address: sip:UserA@AAA.BBB.CCC.DDD SIP tag: D33F86B0-94F Message From Cisco AS5300 to OpenSER Session Initiation Protocol Status-Line: SIP/2.0 200 OK Status-Code: 200 Resent Packet: False Message Header Via: SIP/2.0/UDP WWW.XXX.YYY.ZZZ;branch=z9hG4bK6a82.677fb8e1.0,SIP/2.0/UDP FFF.GGG.HHH.III:50841;branch=z9hG4bK90436408698e6881 From: <sip:UserB@WWW.XXX.YYY.ZZZ>;tag=266f5f157860b9ca SIP from address: sip:UserB@WWW.XXX.YYY.ZZZ SIP tag: 266f5f157860b9ca To: <sip:UserA@AAA.BBB.CCC.DDD>;tag=D33F86B0-94F SIP to address: sip:UserA@AAA.BBB.CCC.DDD SIP tag: D33F86B0-94F