10 May
2006
10 May
'06
11:26 a.m.
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