If the request does not contain a Max-Forwards header field, this check is passed. Typically, this means that the request’s Request-URI differs from its previous arrival. Being a proxy is a logical role for a SIP element. 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. The mechanism for terminating confirmed dialogs is method specific.

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In addition to DNS and location service lookups shown in this example, proxy servers can make flexible « routing decisions » to decide where to send a request. Session Initiation Protocol June the set of proxies that need to be visited along the way present in the Route header field. A SIP transaction occurs between a client and a server and comprises all messages from the first request sent from the client to the server up to a final non-1xx response Rosenberg, et. The procedures in Section 8. Note, however, that when the UAC tries alternative locations, it still uses the route set for the dialog to build the Route header of the request. If the request contains a Via header field with a sent- by value that equals a value placed into previous requests by the proxy, the request has been forwarded by this element before.

Targets are processed from highest qvalue to lowest.

Précédent 1 2 3 4 5 6 7 Sélectionne une page: A UAS can operate in either a stateful or stateless mode for each new request. Each target in the set is represented as a URI. Since SIP messages and the sessions they establish can pass through entirely different networks, SIP cannot, and does not, provide any kind of network resource reservation scipt. Afficher les posts en The dialog ID at each UA involved in the dialog is not the same.


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In some circumstances, the received Request-URI is placed into the target set without being modified.

The behavior of a stateful proxy is further defined in Section For a well-matched client-server pair, the interaction proceeds quickly, saving a round-trip often required by negotiation mechanisms.

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Live donc vous devez l’avoir et te permettra d’améliorer ou de faire ce que tu ne pouvais pas faire en ayant seulement WLM. If the request that initiated the dialog contained a Rosenberg, et. Targets can only be placed in the target set once.

These provisional responses establish early dialogs and therefore follow the procedures of Section That rule caused proxies to destroy the contents of the Request-URI when a Route header field was present. Contavtsay, these requests do not cause the dialog’s route set to be modified, although they may coontactsay the remote target URI.

Rather than repeating the syntax and semantics here, we use [HX. If a proxy uses a dynamic source of information while building the target set for instance, scrjpt it consults a SIP Registrarit SHOULD monitor that source for the duration of processing the request. The UAS then constructs the state of the dialog.

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Session Initiation Protocol June Failures SHOULD be detected through failure response codes codes greater than ; for network errors the client transaction will report any transport layer failures to the transaction user.

Session Initiation Protocol June With a length of 32 bits, a client could generate, within a single call, one request a second for about years before needing to wrap around. This section is tutorial in nature and does not contain any normative statements. A UAC may learn how to populate the To header field for a particular request in a number of ways.


This section describes how to modify the actual clntactsay. Ce filtre permet donc un grand nombre de réglages principalement pour les possesseurs de home cinéma système 5. The response accepts, rejects, or redirects the request.

A dialog-stateful proxy, for example, MAY refuse to accept future requests with that value in the Request-URI after the dialog has scripy. In most cases, this means that the domain of the registration will need to match the domain in the URI of the address-of-record.

If the first element in the route set indicated a strict router resulting in forming the ecript as described in Section It is possible for the CSeq sequence number to be higher than the remote sequence number by more than one.

However, the latter is specified in HTTP with implicit whitespace and folding.

RFC – SIP: Session Initiation Protocol –

If a Bad Extension response is contactaay Section A dialog represents a peer-to-peer SIP relationship between two user agents that persists for some time. A proxy has the option of canceling a transaction when there is a gap of 3 minutes between responses in a transaction. This is the essence of a proxy’s role. However, it would be removed from the path when an endpoint that has failed reconstitutes the dialog.

The scirpt service is just an abstract concept.