SIP (Session Initiation Protocol, RFC [2]) is a text-based application in the SIP specification (RFC ) to locate the proper resource in the network. RFC Client-Initiated Connections in SIP October the Trust Legal .. flow, instead of resolving the Contact URI using the procedures in [RFC] and . Canonical URL: ; File formats: Plain Text PDF Discuss this RFC: Send questions or comments to [email protected]

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SIP extensions for the IP Multimedia Subsystem

These two extensions ietff users to specify their preferences about the service the IMS provides. This way, the registrar is able to discover and record the sequence of proxies that must be transited to get back to the user agent. Oracle Communications Converged Application Server supports applications that conform to this specification. Moreover, there is also a mechanism for conditional event notification that allows the notifier to decide whether or not to send the complete NOTIFY message depending on if there is something new to notify since last subscription or there is not.

The private extensions for media authorization [29] link session signaling to the QoS mechanisms applied to media in the network, oetf defining the mechanisms for obtaining authorization tokens and the P-Media-Authorization header field to carry these tokens from the P-CSCF to the user agent. Current information, if any, about IPR issues:. Views Read Edit View history.

Once this response has been sent, the called party has selected the codec too, 33263 starts resource reservation on its side. The degree of stability or maturity of the document: Retrieved December 2, The REFER message also implies an event subscription to the result of the operation, so that the sender will know whether or not the recipient could contact the third person.

The SIP extension for event state publication [11] was defined to allow user agents to publish the frc of an event to the entity notifier that is responsible for composing the event state and distributing it to the subscribers.


Oracle Communications Converged Application Server supports applications that conform to this specification, but it does not provide an ISUP interface. Retrieved December 4, These header fields are used for a variety of purposes including charging and information about the networks a call traverses:. The Content-Disposition Header Field.

Retrieved November 15, Any explicit references within that referenced document should also be listed: To indicate so, they must insert the privacy token id into the Privacy header field. The aim of event notification is to obtain the status of a given resource e. Moreover, the SIP INFO method extension is designed to carry user information between terminals without affecting the signaling dialog and can be used to transport the dual-tone multi-frequency signaling to provide telephone keypad function for users.

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The security mechanisms agreement irtf for SIP [28] was then introduced to provide a secure mechanism for negotiating the security algorithms and parameters to be used by the P-CSCF and the terminal. In the IMS, the initial session parameter negotiation can be done by using the provisional responses and session description updating extensions, along with SDP in the body of the messages.

The extension for service route discovery during registration [31] consists of a Service-Route header field that is used by the registrar in a 2XX response to a REGISTER request to inform the registering user of the entity that must forward every request originated by him or her. Other for any supplementary information:. Retrieved 3 December Other specific requirements are: Session Initiation Protocol v1.

In SIP, the route header field, filled by the sender, supports this functionality by listing a set of proxies the message will visit. The ieft SDP attributes are meant to describe the current status of the resource reservation, the desired status of the reservation to proceed with session establishment, and the confirmation statusto indicate when the reservation status should be confirmed.

This extension uses three new header fields to support the negotiation process:.

RFC – Session Initiation Protocol (SIP): Locating SIP Servers

In the IMS it is possible for a user to have multiple terminals e. Finally, when privacy is requested, proxies must withhold asserted identity information outside the trusted domain by removing P-Asserted-Identity headers before forwarding user requests to untrusted identities outside the Trust Domain. Source routing is the mechanism that allows the sender of a message to specify partially or iett the route the message traverses.


From Wikipedia, the free encyclopedia. By using this site, you agree to the Terms of Use and Privacy Policy. IP multimedia concepts and services 2 ed. Numerous extensions exist and many more are proposed. Feedback Contact Us Accessibility.

In the IMS framework, it is required that once the callee is alerted, the tfc of a session failure are minimum. There are several standards that address this requirements, such as the following two for services interworking rfx the PSTN and the Internet i. Therefore, a mechanism is needed in order to frc requests to the desired device or application. Oracle Communications Converged Application Server supports cryptographic services, but specific algorithms that are used are subject to local availability and export control.

Frc 5 December RFCs, ffc,,, Errata Exist. Current information, if any, about IPR issues: Likewise, if the server does not support any of the client’s required extensions, it will send an error response with a list of its unsupported extensions. Merging the Internet and the Cellular Worlds 3 ed. The state publication framework defines a new method: This RFC has been in existence since June There is also an allow-events header to indicate event notification capabilities, and the accepted and bad event response codes to indicate if a subscription request has been preliminary accepted or has been turned down because the notifier does not understand the kind of event requested.

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