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Chapter 20. Exchange 2010 and SharePoint... > Unified Messaging Protocols

Unified Messaging Protocols

The Exchange 2010 Unified Messaging servers use several telephony-related protocols to integrate and communicate with telephony devices. These protocols are listed and discussed in the following list:

Session Initiation Protocol (SIP)—This is the signaling protocol that is used to set up and tear down VoIP calls. These calls include voice, video, instant messaging, and a variety of other services. The SIP protocol is specified in RFC 3261 produced by the Internet Engineering Task Force (IETF) SIP Working Group. SIP is only a signaling protocol and does not transmit data. After the call is set up, the actual communications take place using the RTP for voice and video or T.38 for faxes.


Exchange 2010 only supports SIP over TCP. SIP, in general, can be configured to run over User Datagram Protocol (UDP) or Transmission Control Protocol (TCP). UDP is connectionless and does not provide reliability guarantees over the network. TCP is connection-oriented and provides reliability guarantees for its packets. Exchange 2010 UM supports either SIP over TCP, SIP over TLS, or Dual where both are supported simultaneously.


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