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Thursday, December 19, 2013

Interop SIP UDP with Lync

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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