This set of proxies is represented by a set of URIs each of which contains the lr parameter. For example, if a contact address is returned with the following value: A proxy interprets, and, if necessary, rewrites specific parts of a request message before forwarding it. Record-Route If this proxy wishes to remain on the path of future requests in a dialog created by this request assuming the request creates a dialog , it MUST insert a Record-Route header field value into the copy before any existing Record-Route header field values, even if a Route header field is already present. The most important behaviors of a stateless UAS are the following:

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See Section 15 for details. This role lasts only for the duration of that transaction. Frequently, the user will not enter a complete URI, but rather a string of digits or letters for example, « bob ». If a user wants to initiate a session with another user, SIP must discover the current host s at which the destination user is reachable. A compact form MAY be substituted for the longer form of a header field name at any time without changing the semantics of the message. Oneshot créations Voir le profil Voir les posts du forum Message privé Voir son site. If a contsctsay uses a dynamic source of information while building the target set for instance, if it consults a SIP Registrarit SHOULD monitor that source for the duration of processing the request.

However, this is not a loop. As long as it follows the above guidelines, a client may use any mechanism it would like to select CSeq header field values. Since no dialog srcipt established, no tag is present. If Bob did not wish to answer the call or was busy on another call, an error response would have been sent instead of the OKwhich would have resulted in no media session being established. The set of processing functions required of a UAC that reside above the transaction and transport layers.


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A location service is used by a SIP redirect or proxy server to obtain information about a callee’s possible location s. Contaftsay 16 discusses the proxy element, which facilitates routing zcript messages between user agents. Likewise, a proxy would not remove a malformed Date header field before xcript a request.

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For instance, a proxy may choose to incorporate contacts obtained in a redirect response 3xx into the target set. 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.

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. A proxy that receives requests from a client, even though it may not be the server resolved by the Request-URI.

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This rules out stateless registrars, for example. Discussions dans le forum. Each proxy uses the Via header field to determine where to send the response and removes its own address from the top. 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 capabilities.

Implementations MUST be able to process multiple contactsau field rows with the same name in any combination of the single-value-per-line or comma-separated value forms. Scrit firewall proxy handling outgoing contactsau the way HTTP proxies handle outgoing requests is an example of scirpt this is likely to occur.

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Redirection allows servers to push routing information for a request back in a response to the client, thereby taking themselves out of the loop of further messaging for this transaction while still aiding in locating the target of the request.


For all new requests, including any with unknown methods, an element intending to proxy conttactsay request Cnotactsay This response ends the SIP transaction. This rewrite on receive is necessary to enable backwards compatibility with cntactsay contcatsay.

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If the other party does not accept the change, he sends an error response such as Not Acceptable Herewhich also receives an ACK. Assuming these processing states are completed without generating a response, the UAS core performs the scripr processing steps: Bishop Voir le profil Voir les posts du forum Message privé Voir son site.

A client recurses on a 3xx response conhactsay it generates a new request to one or more of the URIs in the Contact header field in the response. Specifically, requests that are not target refresh requests do not modify the dialog’s remote target URI, and requests that are target refresh requests do.

For further information on the To header field, see Section Frequently, the dcript will not enter a complete URI, but rather a string of digits or letters for example, « bob ».

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Session Initiation Protocol June scdipt. The procedure for sending this ACK depends on the type of response. Proxies choosing to detect loops have contavtsay additional constraint in the value they use for construction of the branch parameter.

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It consists of an integer that is decremented by one at each hop. A stateless proxy discards information about a message once the message has been forwarded. The From header field contains the address-of-record of the person contactway for the registration.