I would like to connect Exchange 2k7 with CM4.1. Microsoft doesn't support it in a production environment. My question is, what solution can I use as maybe a VOIP gateway between Exchange and CM4.1 to allow this to work? I have seen implementations of Asterisk but it only uses SIP over UDP and Exchange uses SIP over TCP. Others have stated OpenSER "Sip Express Router" works. Upgrading to CCM 5.0 is not an option at the moment.
What should I use as a solution to bridge CCM 4.1 with Exchange 2k7 and is anyone using this solution in production?