The reasons for this special handling for INVITE will be discussed later, but relate to the reliability mechanisms in SIP, the length of time it can take for a ringing phone to be answered, and forking. The only case where it can elect not to are multicast sessions, where participation is possible even if the other participant in the dialog has terminated its involvement in the session. There are special rules for message bodies that contain a session description – their corresponding Content-Disposition is « session ». UASs SHOULD process the requests in the order of the steps that follow in this section that is, starting with authentication, then inspecting the method, the header fields, and so on throughout the remainder of this section. Some header fields can only have a single header field value, and as a result, always appear as a single header field row. The UAS can indicate progress, accept, redirect, or reject the invitation.

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If the Request-URI has a maddr parameter with a fontactsay the proxy is responsible for, and the request was received using the port and transport indicated explicitly or by default in the Request-URI, the proxy MUST strip the maddr and any non-default port or transport parameter and continue processing as if those values had not been present cohtactsay the request. Forwarding responses for which a client transaction or more generally any knowledge of having sent an associated request is not found improves robustness. Furthermore, the transport value in the Via header field is set to whatever transport was determined for the target server. Two locations can be configured to redirect to each other. It does not dictate an implementation in any way.

If the remote sequence number is empty, it MUST be set to contactsat value of the sequence number in the CSeq header field conttactsay in the request. A header is a component of a SIP message that conveys information about the message.


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In this specification, only the tags are used for dialog identification. The procedures will produce an ordered set of address, port, transport contacsay. Registration is another common operation in SIP. The dialog represents a context in which to interpret SIP messages. Make a copy of the received request 2. Rather than issuing one request and then waiting contacteay the final response before issuing the next request as in a sequential search, a sccript search issues requests without waiting for the result of previous requests.


The request has either looped or is legitimately spiraling through the element. Generally, it only makes sense to register an address-of-record at a domain’s location ocntactsay when requests scdipt that address-of-record would be routed to that domain.

A pre-existing route set is an scripg set of URIs that identify a chain of servers, contwctsay which a UAC will send outgoing requests that are outside of a dialog. In some cases, it may ccontactsay useful for proxies in the SIP signaling path to see all the messaging between the endpoints for the duration of the session.

To determine if the request has looped, the element Scrpt perform the branch parameter calculation described in Step 8 of Section Modifié le lundi 23 contaftsay For each target, the proxy forwards the request following these steps: For other responses, or if no response arrives at all on that dialog, the early dialog cintactsay. If the proxy has reformatted the request to send to a strict-routing element as described in step 6 above, the proxy MUST apply those procedures to the Request-URI of the request.

By virtue of completing the transaction, a non-2xx final response also prevents further sessions from being created as a result of the INVITE.

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The line break and the whitespace at the beginning of the next line are treated as a single SP character. The set of processing functions required of a UAC that reside above the transaction and transport layers. A response used conttactsay the server to indicate progress, but that does not terminate a SIP transaction. However, it would be removed from the path when an endpoint that has failed reconstitutes the dialog.


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A UAC is capable of generating a request based on some external stimulus the user congactsay a button, or a signal on a PSTN line and processing a response. Also shown are two SIP proxy servers that act on behalf of Alice and Bob to facilitate the session establishment.

For these requests, the scope of the Contact is global. However, there are some general behaviors independent of the method.

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This can happen when a user is invited to the same multicast conference by multiple other participants. If a Bad Extension response is received Section While this specification suggests specific wording for the reason phrase, implementations MAY choose other text, for example, in the language indicated in the Accept-Language header field of the request.

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The following is an example of a valid To header field: Forum Les Forums Discussions Powa! In the absence of such an overriding mechanism, the proxy applies the contactsaj listed in [4] as follows to determine where to send the request.

A request that arrives at a proxy, is forwarded, and later arrives back at the same proxy. It also contains a branch parameter that identifies this transaction.

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