[Freeswitch-users] FreeSwitch not preserving the 'Via' in the answer to the BYE message

[Stefano Bertuola]

Hi all.

I have an issue/doubt regarding Via header. The scenario is a FreeSwitch connected to a Mavenir's IMS; call is generated by FS towards Mavenir's IMS (it is ok) and release (BYE) is coming from IMS:

Request-Line: BYE sip:gw+ibcf_gateway at 192.168.242.42:5060;transport=udp;gw=ibcf_gateway SIP/2.0
Message Header
     [truncated]Via: SIP/2.0/UDP scscf.ims.mnc001.mcc001.3gppnetwork.org:5060;rport;branch=z9hG4bKmavodi-0-4c-bf-2-640020-4df45e927c208f36,SIP/2.0/UDP tas.ims.mnc001.mcc001.3gppnetwork.org:5060;received=192.168.239.37;rport=5060;branch=z9hG4bK
        Transport: UDP
        Sent-by Address: scscf.ims.mnc001.mcc001.3gppnetwork.org
        Sent-by port: 5060
        RPort: rport
        Branch: z9hG4bKmavodi-0-4c-bf-2-640020-4df45e927c208f36
        Transport: UDP
        Sent-by Address: tas.ims.mnc001.mcc001.3gppnetwork.org
        Sent-by port: 5060
        Received: 192.168.239.37
        RPort: 5060
        Branch: z9hG4bKmavodi-0-7e-76-1-ffffffff-3029420078-24076
    Max-Forwards: 69
    From: <sip:+628811451570 at ims.mnc001.mcc001.3gppnetwork.org>;tag=mavodi-0-7e-76-1-ffffffff-_000C2939994E-5e0c-a2ac4700-5df-5ae2f6d8-24075
    To: "+628811452131" <sip:+628811452131 at 192.168.242.42>;tag=HHXppypZBv2aS
    Call-ID: f4973e3c-c4a8-1236-15b0-000c29581a5f
    CSeq: 122076474 BYE
    Content-Length: 0
    P-Access-Network-Info: 3GPP-E-UTRAN-TDD;utran-cell-id-3gpp=5102800640033101
    P-Charging-Vector: icid-value=0.82.760-1524823768.21;icid-generated-at=192.168.239.35;term-ioi=Ioi1;orig-ioi=22345
    P-Charging-Function-Addresses: ccf=ims.mnc001.mcc001.3gppnetwork.org;ecf=ims.mnc001.mcc001.3gppnetwork.org;ccf=ims.mnc001.mcc001.3gppnetwork.org;ecf=ims.mnc001.mcc001.3gppnetwork.org


Status-Line: SIP/2.0 200 OK
Message Header
    Via: SIP/2.0/UDP scscf.ims.mnc001.mcc001.3gppnetwork.org:5060;rport=5060;branch=z9hG4bKmavodi-0-4c-bf-2-640020-4df45e927c208f36;received=192.168.239.36
        Transport: UDP
        Sent-by Address: scscf.ims.mnc001.mcc001.3gppnetwork.org
        Sent-by port: 5060
        RPort: 5060
        Branch: z9hG4bKmavodi-0-4c-bf-2-640020-4df45e927c208f36
        Received: 192.168.239.36
    From: <sip:+628811451570 at ims.mnc001.mcc001.3gppnetwork.org>;tag=mavodi-0-7e-76-1-ffffffff-_000C2939994E-5e0c-a2ac4700-5df-5ae2f6d8-24075
    To: "+628811452131" <sip:+628811452131 at 192.168.242.42>;tag=HHXppypZBv2aS
    Call-ID: f4973e3c-c4a8-1236-15b0-000c29581a5f
    CSeq: 122076474 BYE
    User-Agent: FreeSwitch
    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
    Supported: timer, path, replaces
    Content-Length: 0

In the 200 OK replied back by FS to the BYE message, part of the 'Via' header is "missing".

According to RFC 3261:  "The Via header field values in the response MUST equal the Via header field values in the request and MUST maintain the same ordering".

Is it a expected behavior? Any variable to set in order to get the "original" 'Via' header in the answer?

Br. Stefano
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