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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ITU-T A.5 reference justification
In this case, Uniform Resource Names are used to identify a service e. Other for any supplementary information:. This page was last edited on 10 Septemberat RFCs,,,,Errata Exist.
In a first approach, this dictionary may be built for each message by the compressor and sent to the decompressor along with the message itself. Retrieved 5 December To indicate so, they must insert the privacy token id into the Privacy header field.
Technical Product Description
Feedback Contact Us Accessibility. The degree of stability or maturity of the document: There exist analogous extension headers for handling the identification of services of users, [25] instead of the users themselves.
A typical use of this mechanism is call transfer: PRACK, which is the request message used to tell the sender of a provisional response that his or her message has been received.
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. URLs for Telephone Calls. To solve this problem, the concept of preconditions [18] was introduced. In the IMS every user agent is served by its P-CSCF, which is discovered by using the Dynamic Host Configuration Protocol or an equivalent mechanism when the user enters the IMS network, and all requests and responses from or to the user agent must traverse this proxy.

If these extensions are not listed in the client’s message, the response from the server will be an error response. In the IMS framework, it is required that once the callee is alerted, the chances of a session failure are minimum.
The P-Preferred-Identity extension header is also defined, so that a user with several public identities is able to tell the proxy which public identity should be included in the P-Asserted-Identity header when the user is authenticated. Therefore, NAT traversal mechanisms are needed for both the signaling plane and the media plane. In order to make an efficient use of the signaling messages, it is also possible to establish a limited notification rate not real-time notifications through a mechanism called event throttling.
The aim of event notification is to obtain the status of a given resource e. The state publication framework defines a new method: Retrieved 15 November To indicate that the user agent requests or supports reliable provisional responses, the rel option tag will be used.
SCTP supported only for Diameter traffic. An important source of failure is the inability to reserve network resources to support the session, so these resources should be allocated before the phone rings.
Oracle Communications Converged Application Server supports cryptographic services, but specific algorithms that are used are subject to local availability and export control. Other specific requirements are: However, as many words are repeated in different messages, the extended operations for SigComp [34] define a way to use a shared dictionary among subsequent messages. Any explicit references within that referenced document should also be listed:. This token will be obtained from its P-CSCF, ietr may be itef charge of QoS policy control or have an interface with the policy control entity in the network i.
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. The main functionality is supported by the P-Asserted-Identity extension header. Clear description of the referenced document:.
The IMS is meant to provide multimedia services over IP iehf, but also needs a mechanism to charge users for it. In that case, user agents or servers use the Allow header to state which methods they support. In the IMS, the initial session parameter negotiation can be done by using the provisional responses and session letf updating extensions, along with SDP in rrfc body of the messages.

This functionality is supported by the new MESSAGE method, that can be used to send an instant message to the resource stated in the request-URI, with the content carried in the message body.
There is a mechanism [36] to indicate that a SIP message is desired to be compressed. Current information, if any, about IPR issues:. SIP is an exceptionally popular and extensible protocol. Current information, if any, about IPR issues: This RFC has been in existence since June They were designed specifically to meet the 3GPP iett because a more general solution was not available.

Other useful information describing the “Quality” of the document:
