What Protocol and ports does Live Communication Server use?
To Create and maintain instant message sessions, send and receive instant messages and maintain presence information the SIP protocol and (SIMPLE) Presence Leveraging Extensions are used. SIP is a open standard application layer protocol developed by the IETF for the purpose of establishing, modifying, and terminating multimedia sessions you can find the RFC here. By default SIP over TCP uses port 5060. If your using TLS the default port SIP will use is 5061. For more information on SIP check out the SIP Center. For voice and audio streams the SIP protocol is used to establish the connection and then both the clients talk peer to peer over the RTP protocol. The T.120 protocol is used when users perform data collaboration such as whiteboard sharing and application sharing.
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