SIP for Instant Messaging in .NET framework

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the Event: header and the format of the message bodies to be used in the SUBSCRIBE and NOTIFY requests One example of such specification details can be found in an Internet draft that details how the SUBSCRIBENOTIFY technique can be used for presence information
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SIP for Instant Messaging
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We have already discussed the usage of SIP event notifications in relation to presence information for instant messaging applications In fact, SIP has been proposed by many as a unifying protocol to replace the several incompatible protocols that have existed to date To that end, a separate IETF working group has been established to develop a specification for the use of SIP for instant messaging That working group is titled SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE) The SIMPLE working group has already developed an Internet draft for presence functions, an important aspect of instant messaging Another important aspect is the mechanism by which the instant messages themselves are passed between users One solution is a new SIP method, the MESSAGE request, which is proposed in an Internet draft Instant messaging typically involves the exchange of content between a set of participants in near real time Generally, the content is short text messages, although that need not be the case, and other content (such as images or other binary data) can also be transferred Generally, the messages that are exchanged are not stored, but this also need not be the case Instant messaging differs from e-mail in common usage in that instant messages are usually grouped together into brief live conversations Although some instant messaging protocols do establish a session between users, most often individual messages are stand-alone, and no explicit relationship exists between messages Although there can be the appearance of a session between users, that appearance is often a function of the clientuser interface or just a function of the conversation that takes place SIP is well suited to a session-based instant messaging solution, where the session would be instigated with an INVITE request and terminated with a BYE request Supporting an instant messaging regime where each message is stand-alone, however, needs an extension to the basic SIP protocol The proposed extension is the new MESSAGE method A user that wants to send an instant message to another user does so through the issuance of a MESSAGE request This request carries the actual message in a message body The message body will typically be of the form text/plain or may be in the form message/cpim, where cpim stands for
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The Session Initiation Protocol (SIP)
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The Session Initiation Protocol (SIP)
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common presence and instant message format, an IETF format designed for instant message data Unlike an INVITE, a MESSAGE request does not establish a SIP dialog MESSAGE requests can, however, be associated with an existing SIP dialog An instant message sent between two parties during an existing session would be associated with the dialog of that session In many cases, however, a MESSAGE request will simply be sent between two users and will not be associated with any session Therefore, if a MESSAGE request is sent outside an existing dialog, it is not required that any tag value be included in the To: header Figure 5-19 shows an example of the MESSAGE method as a means for passing instant messages Two messages are shown In the first case, Boss sends a message to Daniel via a proxy When the message is delivered, a 200 (OK) response is returned Subsequently, Daniel wants to respond to the instant message and constructs a MESSAGE request of his own This request is also sent via a proxy and a 200 (OK) response is returned Note that both of the messages are sent via the same proxy in Figure 5-19 From a protocol perspective, the two MESSAGE requests are totally independent Therefore, the MESSAGE request from Daniel to Boss might traverse a different proxy (or proxies) than the MESSAGE request from Boss to Daniel In Figure 5-19, we see that none of the Contact:, Record-Route:, or Route: headers are included The Contact: header is strictly forbidden with the MESSAGE method The Record-Route: and Route: headers are not relevant to the MESSAGE method because those headers are related to a specific dialog, and the MESSAGE method does not establish a SIP dialog
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