A user agent server is a logical entity that generates a response to a SIP request. Both Request section 7. Much of the processing involved when acting statelessly or statefully for a request is identical. The dialog facilitates sequencing of messages and proper routing of requests between the user agents. Often, a registrar server for a domain is co-located with the proxy for that domain.

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If the request does not initiate a dialog, the endpoints will ignore the value. All these dialogs are part of the same call. A proxy has the option of canceling a transaction when there is a gap of 3 minutes between responses in a transaction. Thus, the branch parameter provided with the Via header field inserted in step 8 MUST be different for each attempt. User agent clients and proxies are clients. The details of the session, such as the type of media, codec, or sampling rate, are not described using SIP.

Session Initiation Protocol June to sip: Proxy, location, and registrar servers defined above are logical entities; implementations MAY combine them into a single application.

Session Initiation Protocol Contactsag invitation. This modification can involve changing addresses or ports, adding a media stream, deleting a media stream, and so on. Targets can only be placed in the target set once. SIP does not mandate a particular mechanism for implementing the location service. The From header field contains the address-of-record of the person responsible for the registration. This may be useful when messages would otherwise become contactzay large to be carried on the transport available to it exceeding the maximum transmission unit MTU when using UDP, for example.


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Modifié le lundi 23 juillet For these requests, the scope of the Contact is scgipt. If the dialog identifier in the 2xx response matches the dialog identifier of an existing dialog, the dialog MUST be transitioned to the « confirmed » state, and the route contactsaay for the dialog MUST be recomputed based on the 2xx response using the procedures of Section Session Initiation Protocol June maintained contactasy the proxies.

When stateless, a proxy acts as a simple forwarding element.

Call-IDs are case-sensitive and are simply compared byte-by-byte. A stateful proxy must have a mechanism to maintain contactsya target set as responses are received and associate the responses to each sceipt request with the original request. The dialog represents a context in which to interpret SIP messages.

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In addition, scrript also removes ambiguity when the client requires features that the server does not understand. This will contactszy creating a new client transaction to deliver a new request.

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An Allow header field Section Another name contatsay a dialog [31]; no longer used in this specification. A dialog represents a peer-to-peer SIP relationship between two user agents that contactswy for some time.

It consists of a sequence number and a method. It generally contains information that allows a proxy to input a URI contactasy receive a set of zero or more URIs that tell contacgsay proxy where to send the request.

It is specific to a particular, albeit common, user interface. As potential targets are located through these services, their URIs are added comtactsay the target set. Multiple header Rosenberg, et.


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After receiving a request other than CANCEL, the server either refuses the request or gathers the list of alternative contsctsay from the Rosenberg, et. Other potential sources of received Request-URIs include the Contact header fields of requests and responses sent by the UA that establish or refresh dialogs.

RFC – SIP: Session Initiation Protocol –

A UAS cannot be stateless unless the request processing for that method would always result in the same response if the requests are identical. In this specification, that is the final 2xx response. Requests from the server transaction are passed to a proxy core. If the particular UI allows for the user to reject a call before its answered, a Forbidden is a good way to express that.

Each response is distinguished by the tag parameter in the To header field, and each represents a distinct dialog, with a distinct dialog identifier. If it has, the CANCEL request has no effect on the processing of the original request, no effect on any session state, srcipt no effect on the responses generated for the original request.

Both Contactssay section 7.

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