To enable Exchange Unified Messaging (UM) functionality, Exchange Server 2007 needs to be connected to your telephony systems. This requires some telephony equipment, knowledge and skills not pr...
Updated Jul 01, 2019
Version 2.0
Blog Post
Mark,
UM supports SIP over TCP and not SIP over UDP. Many of the low-end gateways only support SIP over UDP. Beyond that, SIP is a fairly flexible protocol and there is still plenty of scope for a generic SIP/VoIP not to work with Exchange 2007 UM. The AudioCodes and Intel gateways have been extensively tested.
UM supports SIP over TCP and not SIP over UDP. Many of the low-end gateways only support SIP over UDP. Beyond that, SIP is a fairly flexible protocol and there is still plenty of scope for a generic SIP/VoIP not to work with Exchange 2007 UM. The AudioCodes and Intel gateways have been extensively tested.