[SR-Users] Kamailio drop calls with Teams

Antony Stone Antony.Stone at kamailio.open.source.it
Thu Sep 3 13:20:22 CEST 2020

On Thursday 20 August 2020 at 12:25:28, sip user wrote:

>  Hi, I'm connecting Teams with kamailio server. From Kamailio to teams I
> have no problems, but from teams to Kamailio yes. Drop the call..

> #!define WITH_TLS
> event_route[tm:local-request] {
>         if(is_method("OPTIONS") && $ru =~ "pstnhub.microsoft.com") {
>                append_hf("Contact: <sip:FQND:5061;transport=tls>\r\n");
>         }
>         xlog("L_INFO", "Sent out tm request: $mb\n");
> }

> What I'm doing wrong?
> I don't understand why not received ACK..
> Could anyone help me?

I am very far from being a Kamailio expert, but isn't this just a typo, and 
"FQND" should be "FQDN"?


90% of networking problems are routing problems.
9 of the remaining 10% are routing problems in the other direction.
The remaining 1% might be something else, but check the routing anyway.

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