[SR-Users] MS Teams Direct routing with kamailio

[Henning Westerholt]

Hi Karsten,

Try this:

event_route[tm:local-request] {

        if(is_method("OPTIONS")) {
               append_hf("Contact: foobar\r\n");
        }
}

U YYYYY:5060 -> XXXXXX:5060
OPTIONS sip:sip.XXXXX.microsoft.com SIP/2.0.
Via: SIP/2.0/UDP YYYYY;branch=z9hG4bK20ab.bd499990000000000000000000000000.0.
To: <sip:sip.XXXXX.microsoft.com>.
From: <sip:dispatcher at localhost>;tag=3393f0703fb0ccaca74109ff37de39f5-50a8.
CSeq: 10 OPTIONS.
Call-ID: 6b3a52797fe20b99-14352 at 127.0.0.1.
Max-Forwards: 70.
Content-Length: 0.
User-Agent: Kamailio.
Contact: foobar.

Cheers,

Henning

--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://skalatan.de/services

From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Karsten Horsmann
Sent: Tuesday, October 22, 2019 6:24 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: [SR-Users] MS Teams Direct routing with kamailio

Hello List,

i search for the right place in kamailio to manipulate the dispatcher OPTIONS packets to add an Contact header.

For uac generated traffic i can use the event_route[tm:local-request] from the tm module.
But how can i manipulate kamailio *self* generated OPTION pings from the dispatcher?

OPTIONS request for MS Teams must contain the Contact header of such a format:
Contact: <sip:SBC_FQDN:5061;transport=tls>

I follow this guide (for opensips) and try to adapt that step by step to kamailio:

https://blog.opensips.org/2019/09/16/opensips-as-ms-teams-sbc/

CentOS 7 / kamailio 5.2.x (and maybe soon 5.3.x) / rtpengine
--
Cheers
*Karsten Horsmann*
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