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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The functionality of sending instant messages to provide a service similar to text messaging is defined in the instant messaging extension. Other useful information describing the “Quality” of the document:.

Retrieved November 15, To allow the sender to discover such entities and populate the route iegf field, there are mainly two extension header fields: Views Read Edit View history. 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.

The efficient ketf of network resources, which may include a radio interface or other low-bandwidth access, is 32663 in the IMS in order to provide the user with an acceptable experience in terms of latency.

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 ietd because the notifier does not understand the kind of event requested.

Each kind of event a subscriber can subscribe to is defined in a new event package. Merging the Internet and the Cellular Worlds 3 ed. Therefore, NAT traversal mechanisms are needed for both the signaling plane and the media plane. Justification for the specific reference:. This mechanism is necessary since SIP can run 32663 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.


Retrieved 15 November To indicate that the user agent requests or supports reliable provisional responses, the rel option tag will be used.

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Oracle Communications Converged Application Server does not provide privacy support as described in rrc 5. To obtain transmission resources, the user agent must present an authorization token to the network i.

These header fields are used for a variety of purposes including charging and information about the networks a call traverses:. There exist analogous extension headers for handling the identification of services of users, [25] instead of the users themselves. 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.

Relationship with other existing or emerging documents: Oracle Communications Converged Application Server supports applications that conform to this specification.

RFC – Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)

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 ietg for users.

This page was last edited on 10 Septemberat Oracle Communications Converged Application Server supports applications that conform to this specification, but it does not provide an ISUP interface. This functionality can be implemented as part of the application. This token will be obtained from its P-CSCF, which may be in charge of QoS policy control or have an interface with the policy control entity in the network i.

Current information, if any, about IPR issues: This extension uses three new header fields to support the negotiation process:.

SIP extensions for the IP Multimedia Subsystem

This can be used to negotiate and allocate the call resources before the called party is alerted. In cases where specifications are part ieft a larger release plan, as with the 3GPP, Oracle prioritizes compliance with the latest ratified release in this case, Release 6.


Several SIP extensions have been added to the basic protocol specification in order to extend its functionality. The aim of event notification is to obtain the status of a given resource e.

This extension is only applicable within administrative domains with trust relationships. Feedback Contact Us Accessibility.

Retrieved December 3, 363 is then, when all the resources for the call are in place, when the caller is alerted. The level of compliance is defined as follows:. In basic SIP, this exchange eventually causes the callee to be alerted.

Oracle Communications Converged Application Server does enforce uniqueness. SIP is an exceptionally popular and extensible protocol. 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.

This way the recipient of the message can decide whether or not to follow the reference to fetch the resource, depending on the bandwidth available.

PUBLISH, which is used to request the publication of the state of the resource specified in the request-URI, with reference to tfc event stated in the Event headerand with the information carried in the message body.

The SIP extension for event state publication [11] ketf defined to allow user agents to publish the state of an event to the entity notifier that is responsible for composing the event state and distributing it to the subscribers. Session Initiation Protocol 2.

Accept-Contact to describe the desired destination user agents, Reject-Contact to state the user agents to avoid, and Request-Disposition to specify how the request should be handled by servers in the network i. Feature development is prioritized according to general market trends, both observed and predicted.