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As a result, although DNS and location service lookups were required to route the initial INVITE, the Ringing response can be returned to the caller without lookups or without state being Rosenberg, et. They are processed as if they had been received outside the dialog. It uses this information to affect the processing of future messages associated with that request. In this case, the specific session is the one with the peer UA on the other side of the dialog. 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. Abonne-toi à mon blog! This section is tutorial in nature and does not contain any normative statements.

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Base64 is not permissible for a token. An example would be sips: A proxy has the option of canceling a transaction when there is a gap of 3 minutes between responses in a transaction. It is expected that mandatory conttactsay of the original To and From URI in mid-dialog requests will be deprecated in a subsequent revision of this specification. It has a similar form to an email address, typically containing a username and a host name. Header fields can be extended over multiple lines by preceding each extra line with at least one SP or horizontal tab HT.

A logical entity that does not maintain the client or server transaction state contactssay defined in this specification when it processes requests.

For each target, cohtactsay proxy forwards the request following these steps: It is possible for the CSeq sequence number to be higher than the remote sequence number by more than one.

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Once the request has been constructed, the address of the server is computed and the request is sent, using the same procedures for requests outside of a dialog Section 8. Add a Content-Length header field if necessary If the scrpt will be sent to comtactsay next hop using a stream- based transport and the copy contains no Content-Length header field, the proxy MUST insert one scri;t the correct value for the body of the request see Section Any of these mechanisms can be modeled as accessing an abstract Location Service.

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If the UAC wishes to apply an extension to the request and insist that any proxies that are Rosenberg, et. Session Initiation Protocol June 10 Registrations 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.

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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. As potential targets are located through these services, their URIs are added to the target contaftsay.

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

This is the essence of a proxy’s role.

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Rosenberg Request for Comments: A common way to create this value is to compute a cryptographic hash dontactsay the To tag, From tag, Call-ID header field, the Request-URI of the request received before translationthe topmost Via header, and the sequence number from the CSeq header field, in addition to any Proxy-Require and Proxy-Authorization header fields that may be present. If the dialog identifier in the 2xx response matches the dialog identifier of an existing scriph, the scropt MUST be transitioned to the « confirmed » state, and the route set for the dialog MUST be recomputed based on the 2xx response using the procedures of Section 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.

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script contactsay

If a proxy wishes to detect loops, the scrilt parameter it supplies MUST depend on all information affecting processing of a request, including the incoming Request-URI and any header fields affecting the request’s admission or routing. If they differ, the request is spiraling, and processing continues.

It defines how a client sends requests and receives responses and how a server receives requests and sends responses over the network. Thus, when a proxy for that domain receives a request whose Request-URI matches the address-of-record, the proxy will forward the request to the contact addresses contactsag to that address-of-record. For that reason, CANCEL is referred to as a « hop-by-hop » request, since it is responded to at each stateful proxy hop.

Target refresh requests only update the dialog’s remote target URI, and not the route set formed from the Record-Route. It MUST be possible to combine the multiple header field rows into one « field-name: Thus, the following are equivalent: During the session, either Alice or Bob may decide to change the characteristics of the media session.

User agents contain a transaction layer, as do stateful proxies. The UAS contachsay constructs the state of the dialog.

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If an absolute time is received, it will be treated as malformed, and then default to This allows a UA to provide a new contact address, should its address change during the duration of the dialog. This supports stateless session processing in various elements, and supports failover and recovery capabilities. No provisioning or human interface is required for the selection of the Call-ID header field value for a request. The dialog ID at each UA involved in the dialog is not the same.

This is accomplished with a BYE, as described in Section Proxy-Authorization check If an cntactsay requires credentials before forwarding a request, the request MUST be inspected as described in Section