Lync does not support SIP on UDP (port 5060), it only supports TCP or TLS (again TLS over TCP).
If you have a PBX or something that can work only on UDP, you would need a gateway like SBC or else that does support UDP.
Microsoft defend it's UDP rejection here http://blogs.technet.com/b/nexthop/archive/2008/05/23/to-udp-or-not-to-udp-that-is-the-question.aspx
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