If there are any bodies whose type indicated by the Content-Type , language indicated by the Content-Language or encoding indicated by the Content-Encoding are not understood, and that body part is not optional as indicated by the Content- Disposition header field , the UAS MUST reject the request with a Unsupported Media Type response. Navigation rapide Discussions Powa! Modifié le dimanche 16 septembre The proxy core determines where to route the request, choosing one or more next-hop locations. In rare circumstances, where the server cannot process the request without the extension, the server MAY send a Extension Required response. A logical entity that maintains the client and server transaction state machines defined by this specification during the processing of a request, also known as a transaction stateful proxy.

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The relative order of header field rows with the same field name contcatsay important. A request may traverse several proxies on its way to a UAS. Outils du forum Marquer ce forum comme lu Voir le forum parent Recherche dans ce forum Afficher Montrer les posts. This type of parallel search is known as forking. A call stateful proxy is always transaction stateful, but the converse is not necessarily true. Note that these may be different roles than the UAs held during wcript transaction that established the dialog. For further information on these header fields, see Sections

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Header fields can be extended over multiple lines by preceding each extra line with at least one SP or conactsay tab HT. SIP transparently supports name mapping and redirection services, which supports personal mobility [27] – users can maintain a single externally visible identifier regardless of their network location. A common ordering mechanism scipt to use the qvalue parameter of targets obtained from Contact header fields see Section If the proxy has a local policy that mandates that the request visit one specific proxy, an alternative to pushing a Route value into the Route header field is to bypass the forwarding logic of item 10 below, and instead just send the request to the address, port, and transport for that specific proxy.


The tags are opaque tokens that facilitate the generation of unique dialog IDs. RFC did not mandate mirroring of the Record-Route header field in a 1xx, only 2xx. Two locations can be configured to redirect to each other.

Proxy, location, and registrar servers defined above are logical entities; implementations MAY combine them into a single application. This parameter is used to identify the transaction created by that request.

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Design by lequipe-skyrock Choisir cet habillage. The response does not contain a message body.

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Unless specified otherwise, values expressed as quoted strings are case-sensitive. This rewrite on receive is necessary to enable contachsay compatibility with those elements. Session Initiation Protocol June Section 12 for more information on an endpoint’s use of Record-Route header fields.

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If no SIP extensions have defined other application layer states associated with the dialog, the BYE also terminates the dialog. Session Initiation Protocol June clarity the two are separated in sctipt illustration.

A multimedia session see below that contains multiple participants. Local policy MAY specify an alternate set of destinations to attempt. User agent clients and proxies are clients.

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Set timer C Each of these steps is detailed below: The procedures in Section 8. If none is found, the element MUST process the response even if it is an informational response as a stateless proxy described below.

These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences. For that target, the replacement above is effectively a no-op.

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If the request contains a Via header field with a sent- by value that equals a clntactsay placed into previous requests by the proxy, the request has been forwarded by this element before. During the session, either Alice or Bob may decide to change the characteristics of the media session.


A character string encoded according to RFCSection 2. If the request has a tag in the To header field but the dialog identifier does not match any of the existing dialogs, the UAS may have crashed and restarted, or may have received a request for a different possibly failed UAS. A firewall proxy handling conntactsay calls the way HTTP proxies handle outgoing requests is an example of where this is likely to occur.

SIP is an agile, general-purpose tool for creating, modifying, and terminating sessions that works independently of underlying transport protocols and without dependency on the type of session that is being established.

All SIP elements contain a transport layer. If a contatsay UAS receives a retransmission of a request, it regenerates the response and resends it, just as if it were replying to the first instance of the request.

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After some time, those UASs can accept the invitation meaning the session is to be established by sending a 2xx response.

These 7 characters are used as a magic cookie 7 is deemed sufficient to ensure that an older RFC implementation would not pick such a valueso that servers receiving the request can determine that the branch ID was constructed in the fashion described by this Rosenberg, et.

The dialog facilitates sequencing of messages between the user agents and proper routing of requests between both of them. An implementation is free to take any approach that replicates the external behavior this model defines.