In troubleshooting our Lync 2013 deployment, we were experiencing problems with the both sending and receiving calls to our Lync environment even though we believed we had voice routing and the gateway properly configured. In the OCS Logging logs and the gateway logs we were seeing the error SIP 2.0 / 503 Service Unavailable.
The resolution to the this issues was to add both the internal and external DNS entries for the FQDN of the Lync Edge pool. Making this change allowed Lync to be able to receive calls from both the legacy PBX and PSTN.
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