Registration is another common operation in SIP. Full details on session termination are in Section In this section, we discuss the method-independent rules for UAC and UAS behavior when processing requests that are outside of a dialog. If a client is using an outbound proxy, and that proxy actually redirects requests, a potential arises for infinite redirection loops. For further information on the Contact header field, see Section It is the responsibility of clients to detect forwarding loops between redirect servers. This proxy, in general, has no way of knowing the capabilities of that element, so it must restrict itself to the mandatory elements of a SIP implementation:

Nom: script contactsay
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It consists of an integer that is decremented by one at each hop. A header field value is a single value; a header field consists of zero or more header field values. The set of targets will either be predetermined by the contents of the request or will be obtained from an abstract location service. It has a similar form to an email address, typically containing a username and a host name. Pour installer un script, clique sur le lien, ensuite sur « j’assume la responsabilité d’installer ce script » et enfin sur « Importer ». The same tag MUST be used for all responses to that request, both final and provisional again excepting the Trying. Session Initiation Protocol June Section 12 for more information on an endpoint’s use of Record-Route header fields.

For further information on the Contact header field, see Section The contaactsay set of SIP header fields is defined in Section Contacttsay the softphone does not know the location of Bob or the SIP server in the biloxi. Another is to perform only serial processing in decreasing q-value order, arbitrarily choosing between contacts of equal q-value.

Add a Via header field value 9. If this request is already part of a dialog, the proxy SHOULD insert a Record-Route header field value if it wishes to remain on the path of future requests in the dialog.


script contactsay

This location service is effectively a database containing mappings between contcatsay single URI and a set of one or more alternative locations at which the target of that URI can be found.

Otherwise, this approach MAY be used, but the Route insertion mechanism above is preferred for its robustness, flexibility, generality and consistency of operation. A Via header field value is added only after the transport that will be used to reach the next hop has been selected which may involve the usage of the procedures in [4].

script contactsay

The dialog ID at each UA involved in the dialog is not the same. Rather than repeating the syntax and semantics here, we use [HX. Multiple header field rows with the same field-name MAY be present in a message if and only if scripy entire field-value for that header field is defined as a comma-separated list that is, if follows the grammar defined in Section 7.

Another name scriptt a dialog [31]; no longer used in this specification. A proxy server receives SIP requests and forwards them on behalf of the requestor. This response is constructed following the procedures described in Section 8.

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If the request has a tag in the To header field, but contactswy dialog identifier does not match any existing dialogs, the UAS may have crashed and restarted, or it may have received a request for a different possibly failed UAS the UASs can construct the To clntactsay so that a Contatcsay can identify that the tag was for a UAS for which it is providing recovery.

Both Request section 7. In some circumstances, the received Request-URI is placed into the target set without being contacsay. Allowing a URI to cotnactsay added to the set only once reduces unnecessary network traffic, and in the case of incorporating contacts from redirect requests prevents infinite recursion.

RFC – SIP: Session Initiation Protocol –

I know you’re there, pick up the phone and talk to me! However, the basic functionality and operation of SIP does not depend on any of these protocols. Process all responses Section Modifié le dimanche 16 septembre SIP does not provide services.


The relative order conactsay header field rows with the same field name is important. Some header fields can only have a single header field value, and as a result, always appear as a single header field row. A contacttsay is said to be strict routing if it follows the Route processing rules of RFC and many prior work in progress versions of this RFC.

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. The transaction layer has a client component referred to as a client transaction and a server component referred to as a server transactioneach of which are represented by a finite state machine that is constructed to process a particular request.

The UAS will receive the request from cntactsay transaction layer. Proxies that perform strict routing are conhactsay known as strict routers. That rule caused proxies to destroy the contents of the Request-URI when a Route header field was present.

script contactsay

Requests establishing a dialog may contain a preloaded Route header field. Session Initiation Protocol June Certain other requests are sent within a dialog. Since SIP messages and the sessions they establish srcipt pass through entirely different networks, SIP cannot, and does not, provide any kind of network resource reservation capabilities.

Add a Content-Length header field if necessary If the request will be sent to the next hop using a stream- based transport and the copy contains no Content-Length header field, the proxy MUST insert one with the correct value for the body of contxctsay request see Section Future extensions may define new methods and header fields at any time.

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