January 31, 2013
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I am configuring Lync 2013 to communicate with AudioCodes MediaPack 118 Enhanced Voice Gateway (the device is not certified for Lync 2013).
Listening port on Lync: TCP 5068
Listening port on Audiocodes: TCP 5060
Audiocodes FXS line 1: 2001
line 2: 2002
Lync – Phones traffic flows without problem.
Issue: When I tried to call between phones connected to MP-118 I got a busy signal. Phone call does not pass.
Resolution: In Protocol Configuration – Protocol Definition – SIP General Parameters I had SIP destination port set to 5068 (port on my Lync 2013). It looks like Audiocodes used this port by default for all SIP connection (including connection from connected phone to Audiocodes SIP server itself).
So I added port 5060 to my routing rule describing route for phone-phone calls (switch to Advanced Parameter list):