Introducing Session Initiation Protocol Session Initiation Protocol (SIP) Properly planning how the company will set SIP URIs for each client will prove useful in later stages of a Live Communications Server deployment and for future use of Microsoft Unified Communications products. SIP Methods Session Initiation Protocol uses its own methods to communicate SIP messages between SIP clients and SIP servers. Similar to other Internet protocols, SIP provides a messaging structure. SIP messages include the following methods: . INVITE . ACK . BYE . CANCEL . OPTIONS . REGISTER . SUBSCRIBE . NOTIFY . MESSAGE . INFO . SERVICE . NEGOTIATE . REFER Each SIP message request requires a method, a SIP URI, and the version of SIP that the message request is using. The following table describes briefly each SIP method. SIP Method Method Description ACK The ACK and INVITE message are synonymous in that they are sent together by an initiating client. The ACK method verifies that the session has been initiated. BYE The BYE method terminates the SIP session. This method would be used by a contact that has finished its session with another contact and is ready to exit the session. CANCEL A CANCEL method is used by a client that may have a pending message request that it wants to cancel, terminating the request, but not the session. This would be used if a contact wanted to initiate a collaboration sharing session with another contact and then decided to cancel the request, although both contacts could continue other messaging requests such as Instant Messaging each other. Table continued on following page 17 Introducing Microsoft Unified Communications
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