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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In the IMS framework, it is required that once the callee is alerted, the chances of a session failure are minimum. Therefore, a mechanism is needed in order to route requests to the desired device or application. This extension is only applicable within administrative domains with trust relationships.

This extension uses three new header fields to support the negotiation process:. Retrieved 3 December This page was last edited on 10 Septemberat Views Read Edit View history. This request will be answered by the provisional reliable response code Session Progressthat will carry the SDP list of supported codecs by both the caller and the callee. Session Initiation Protocol v1. Network address translation NAT makes it impossible for a terminal to be reached from outside its private networksince it uses a private address that is mapped to a public one when packets originated by the terminal cross the NAT.

These two extensions allow users to specify their preferences about the service the IMS provides.

It is then, when all the resources for the call are in place, when the caller is alerted. In this concept the caller states a set of constraints about the session i.

The functionality of sending instant messages to provide a service similar to text messaging is defined in the instant messaging extension. This mechanism is necessary since SIP can run not only over reliable transport protocols TCP that assure that the message is delivered, but also over unreliable ones UDP that offer no delivery guarantees, and it is even possible that both kinds of protocols are present in different parts of the transport network.

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Standards Alignment

Any explicit references within that referenced document should also be listed: To this end, the specific event notification extension [10] defines a framework for event notification in SIP, with two new methods: Clear description of the referenced document:. These extensions also allow users to request privacy iett that their identities are not spread outside the trust domain.

When a proxy server receives a request from an untrusted entity and authenticates the user i.

Session Initiation Protocol 2. In the basic SIP specification, [15] only requests and final responses i. This token will be obtained from its P-CSCF, which may be in irtf of QoS policy control or have an interface with the policy control entity in the network i. The degree of stability or maturity of the document: There are several standards that address this requirements, such as the following two for services interworking between the PSTN and the Internet i.

If these extensions are not listed in the client’s message, the response from the server will be an error response.

Retrieved December 3, The security mechanisms agreement extension 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 cases where specifications are part of a larger release plan, as with the 3GPP, Oracle prioritizes compliance with the latest ratified release in this case, Release 6. Therefore, NAT traversal rfv are needed for both the signaling plane and 33263 media plane.

Oracle Communications Converged Application Server supports applications that conform to this specification, but it does not provide a means of storing the ServiceRoute established during registration.

These include an efficient use of the radio interface by minimizing the rfcc of signaling messages between the mobile terminal and the network, ietd minimum session setup time by performing tasks prior to session establishment instead of during session establishment, a minimum support required in the terminal, the support for roaming and non-roaming scenarios with terminal mobility management supported by the access network, not SIPand support for IPv6 addressing.

The degree of stability or maturity of the document:. Feedback Contact Us Accessibility. Event notification is necessary in the IMS framework to inform about the presence of a user i.

SIP extensions for the IP Multimedia Subsystem

This should not be presumed to mean that the product is not compliant with subsequent versions of component specifications, although this document does not summarize compliance with those specifications. All this functionality is supported by new special header fields. The necessity in the IMS of reserving resources to provide quality of service QoS leads to another security issue: The Content-Disposition Header Field.


Yes —Indicates that Oracle Communications Converged Application Server container directly supports the feature or specification. Other useful information describing the “Quality” of the document:. A typical use of this mechanism is call transfer: When a client initiates a SIP dialog with a server, it states the extensions it requires to be used and also other extensions that are understood supportedand the server will then send a response with a list ieyf extensions that it requires.

Technical Product Description

By using the user agent capabilities extension, [9] user agents terminals can describe themselves when they register so that others can search for them according to their caller preferences extension headers. Source routing is the mechanism that allows the sender of a message to specify partially or completely the route the message traverses.

Communicating Presentation Information in Internet Messages: Retrieved December 2, This RFC has been in existence since June Likewise, if the server does not support efc of the ietd required extensions, it will send an error response with a list of its unsupported extensions. Retrieved December 4, The event notification framework defines how a user agent can subscribe to events about the state of a resource, but it does not specify how that state can be published.

RFCs,,,,Errata Exist. 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 level of compliance is defined as follows:.