Lync 2010, front end pool is also doing Mediation services. I have setup a SIP trunk to the Cisco Call manager on site.
From Lync clients, I can call outbound to CM phones and beyond in to the pstn. No issues there.
The problem comes when a cisco phone tries to call the Lync client #. After working with TAC, we see the SIP trace from CM sending out the invite to the mediation server on port 5068 (default TCP listening port for Lync). But an immediate RST.
After looking at the server, I see that there is nothing listening on 5068 or 5067 (Tcp and Tls respectively). Nmap shows no open ports waiting for inbound sip invites.
Firewall is off.
So my question, if someone with a mediation server would confirm, does the mediation server show a listening/open port on 5068 and 5067?
If you answer a yes, then my mediation service is Fubar'd somehow and not listening. (I'm assuming its this answer actually, but need someone to verify).
If you answer a no, then I'll look somewhere else.