[Users] Comma-Separated Via Header

[Dioris Moreno]

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 at 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 at WWW.XXX.YYY.ZZZ>;tag=266f5f157860b9ca
            SIP from address: sip:UserB at WWW.XXX.YYY.ZZZ
            SIP tag: 266f5f157860b9ca
        To: <sip:UserA at AAA.BBB.CCC.DDD>;tag=D33F86B0-94F
            SIP to address: sip:UserA at 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 at WWW.XXX.YYY.ZZZ>;tag=266f5f157860b9ca
            SIP from address: sip:UserB at WWW.XXX.YYY.ZZZ
            SIP tag: 266f5f157860b9ca
        To: <sip:UserA at AAA.BBB.CCC.DDD>;tag=D33F86B0-94F
            SIP to address: sip:UserA at AAA.BBB.CCC.DDD
            SIP tag: D33F86B0-94F
 
 
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