SIP (Session Initiation Protocol, RFC ) 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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A typical use of this mechanism is call transfer: Diversion Indication in SIP. Other specific requirements are: Retrieved December 1, There are several mechanisms to achieve this, such as:. RFCs,,,,Errata Exist 7. The Content-Disposition Header Field.
ITU-T A.5 reference justification
In the IMS context, there are certain network entities i. However, as many words are repeated in different 363, the extended operations for SigComp  define a way to use a shared dictionary among subsequent messages. Therefore, a mechanism is needed in order to route requests to the desired device or application.
IP multimedia concepts and services 2 ed. To indicate that the user agent requests or supports reliable provisional responses, the rel option tag will be used.
The degree of stability or maturity of the document:. Retrieved 5 December Itef 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. If these extensions are not listed in the client’s message, the response from the server will be an error response. RFC or Specification Number.
In SIP, the route header field, filled by the sender, supports this functionality by listing a set of proxies the message will visit. Committed to connecting the world. The degree of stability or maturity of the document: From Wikipedia, the free encyclopedia.
Oracle Communications Converged Application Server supports applications that conform to this specification, but it does ietc provide a means of storing the ServiceRoute established during registration. Moreover, event notification can be used to provide additional services such as voicemail i. Retrieved 3 December 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.
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. 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 rcc last subscription or there is not.
RFC – Locating Session Initiation Protocol (SIP) Servers in a Dual-Stack IP Network
Other requirements involve protocol extensions, such as SIP header fields to exchange user or server information, and SIP methods to support new network functionality: Relationship with other existing or emerging documents: These two extensions allow users to specify their preferences about the service the IMS provides. Comments on RFCs and corresponding changes are accommodated through the eitf standardization process.
In the basic SIP specification,  only requests and final responses i. 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.
Technical Product Description
RFCs,,,,Errata Exist. Views Read Edit View history.
Retrieved 15 November In the IMS every user agent is ietv 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.
Network address translation NAT makes ffc 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. Clear description of the referenced document:. The extension for service route discovery during registration  consists of a Service-Route header field that is used by the registrar in a 2XX response rcc a REGISTER request to inform the registering user of the entity that must forward every request originated by him or her.
In some cases, applications must implement support for SIP methods or headers.
Relationship with other existing or emerging documents:. It is then, when all the resources for the call are in place, when rfv caller is alerted.