Hi,
Contact is mandatory in INVITEs. Per RFC 3261 § 8.1.1.8 ("Contact"):
The Contact header field MUST be present and contain exactly one SIP
or SIPS URI in any request that can result in the establishment of a
dialog. For the methods defined in this specification, that includes
only the INVITE request.
-- Alex
> On 24 Jan 2024, at 05:42, Unai Rodriguez via sr-users
> <sr-users@lists.kamailio.org> wrote:
>
> Dear List,
>
> I’m trying to set up the dialog module and I keep getting the error "bad sip
> message or missing Contact hdr”:
>
> ---
> Jan 23 11:34:17 server.example.com kamailio[2495]: 16(2511) ERROR: {1
> 78451036 INVITE 2ef1d082-3486-123d-0abc-02c8e9c6c24e} dialog
> [dlg_handlers.c:219]: populate_leg_info(): bad sip message or missing Contact
> hdr
> Jan 23 11:34:17 server.example.com kamailio[2495]: 16(2511) ERROR: {1
> 78451036 INVITE 2ef1d082-3486-123d-0abc-02c8e9c6c24e} dialog
> [dlg_handlers.c:952]: dlg_new_dialog(): could not add further info to the
> dialog
> ---
>
> This is for MRCP traffic and the SIP INVITEs do not contain the Contact
> header. They look like this:
>
> ----
> INVITE sip:some.mrcp.server.example.com:8060 SIP/2.0
> Via: SIP/2.0/TCP 10.10.10.10:5099;branch=z9hG4bK5Kpey3r13SBNQ
> Max-Forwards: 70
> From: <sip:10.10.10.10:5099>;tag=134a3eKD2a8Ua
> To: <sip:some.mrcp.server.example.com:8060>
> Call-ID: 051df0ff-3541-123d-f090-02f373ff014c
> CSeq: 78491159 INVITE
> User-Agent: google_stt
> Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY,
> REFER, UPDATE
> Supported: timer, 100rel
> Content-Type: application/sdp
> Content-Disposition: session
> Content-Length: 329
>
> v=0
> o=FreeSWITCH 2474358185109188492 5282339568667506935 IN IP4 10.10.10.10
> s=-
> c=IN IP4 10.10.10.10
> t=0 0
> m=application 9 TCP/MRCPv2 1
> a=setup:active
> a=connection:new
> a=resource:speechrecog
> a=cmid:1
> m=audio 12034 RTP/AVP 0 8 96
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:96 L16/8000
> a=sendonly
> a=mid:1
> ----
>
> According to the RFC, the Contact header is not mandatory
> (https://datatracker.ietf.org/doc/html/rfc3261#section-8.1.1) and I don’t
> have an easy way of adding the Contact header to the INVITEs. Is there a way
> to configure Kamailio’s dialog module to do without the Contact header? Any
> pointers appreciated.
>
> Thank you so much
>
> With best wishes,
> Unai Rodriguez
> __________________________________________________________
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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800
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