Receiving Lync calls on UCMA standalone application

Hi all,

I have this standalone UCMA application that can receive calls from X-Lite.We needed it to receive calls from Lync clients too. So I created a TCP static route in Lync Server that routes all calls addressed tosomething@external to my application.

The application receives the call and the call state goes from Idle to Establishing, but after some time it goes from Establishing to Terminating, and then finishes.

Analyzing the SIP traffic, it's possible to see that the ucma application receives INVITE and sends Trying, Ringing and OK. There are also some RTP (withunknown RTP version 0 message) and RTCP packets sent from the application to Lync client.

Does anyone know what could be happening?

Thanks.