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How Extensions Are Treated
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When a SIP entity receives a SIP message with headers it cannot interpret, it ignores the portions of the SIP message it does not understand. Again the RFC defines a standard set
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of SIP methods (messages) that all SIP entities must be able to understand and process to ensure network operability as well as interoperability. It is this minimum set of requirements that ensures that all networks can interconnect with one another and pass SIP messages forward. All networks must be able to support the basic functions of registration and routing according to RFC 3261. If a SIP entity needs to know what methods another entity can support, it will send the OPTIONS method to the other entity. This allows other entities to discover what methods a network element can support prior to sending an invitation for a session. Hopefully this prevents sessions from being rejected because the network element received a message type (method) it did not understand. The user agent that sends the OPTIONS message could also include the REQUIRES header to identify specific methods, codecs, extensions, or other support needed for sessions. The receiving UAS would then respond with a 2xx. The response would include the ALLOW header listing all of the message types that are allowed or supported by the UAS. The message body carries the Session Description Protocol (SDP), which would then identify the codecs and other resources supported by the responding UAS. The OPTIONS method is only one method that can be used to determine what another network element can support. In the INVITE message itself the REQUIRES header can be used for the same purpose. The ALLOW header would be included in the 2xx response to the INVITE. The syntax and format of these messages is provided in greater detail in 2. All of these mechanisms were introduced to allow network entities to communicate with one another their specific capabilities. This also allows operators to implement specific applications through specific entities, while limiting the support required by other entities to minimum SIP support.
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There are many examples of extensions and how they can be used in the network. These extensions are prefixed with the letter P, indicating they are private extensions. This can be somewhat misleading, though, since the intention is to publish these extensions so that equipment vendors can choose to support them in their respective network types. For example, packet cable networks specify specific headers that need to be supported above and beyond those identified in RFC 3261. Any one wishing to operate in these networks should be able to support these extensions unless they plan on providing nothing more than basic SIP support. Likewise, the 3GPP has defined a number of functions and applications that are required for the network architecture that they have introduced (the IMS). Any operator deploying an IMS network must conform to the 3GPP standards to ensure that all of the entities defined in the IMS architecture work properly and support the functions defined by the 3GPP. Failure to support these extensions does not mean that equipment will not work in a SIP network. All network entities are required to support the functions and
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processes defined in RFC 3261. This includes all headers and methods and their respective parameters. If extensions are included in a message that a network entity does not understand, as we mentioned before, they are simply ignored and the SIP message is processed in terms of the portions of the message that the entity does understand. What it does mean is that some equipment may not support additional functions and applications the operator needs according to the network topology being implemented, and according to the services the operator wishes to provide. The packet cable and IMS are good examples of networks that require the use of specific extensions to work as defined. The following section defines extensions that have been ratified by the IETF and documented in the form of an RFC or 3GPP specification.
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