25 Jan
2024
25 Jan
'24
3:35 a.m.
I tried this (and some variations) to no avail:
request_route {
insert_hf("Contact: $fu\r\n");
...
...
I see the Contact header inserted but after receiving the first SIP INVITE (ie too late).
Is there a way I can instruct the DIALOG module to use a value of Contact that’s been
computed dynamically on the config? Is it possible to modify what Kamailio holds in memory
for the value of Contact before the dialog module processes it? Any other points on how I
could deal with this missing Contact header?
Thank you so much
With best wishes,
Unai Rodriguez
On 24 Jan 2024 at 13:54 +0100, Alex Balashov via sr-users
<sr-users(a)lists.kamailio.org>rg>, wrote:
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(a)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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