Calls fail from Lync to Cisco Call Manager via SBC

Good afternoon everyone!

I have recently been involved in a Lync Enterprise Voice Telephony pilot, coexisting with Cisco Call Manager (CUCM) during the pilot phase.

So to help give a better understanding of the issue, the below diagram summaries the setup.

CiscoSBCLync

 

 

I liked to provide as much info as possible, if you need a quick fix, scroll down to the resolution section 🙂

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