SIP Extensions and Enhancements in .NET

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SIP Extensions and Enhancements
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Since RFC 2543 was released in March 1999 as an Internet standards track protocol, SIP has attracted enormous interest Many companies, including those from the traditional telecommunications environment and others such as cable TV providers and Internet Service Providers (ISPs), have recognized that SIP offers great potential In the process, however, several individuals and companies have found that SIP would be better if some enhancements or extensions were added A large number of extensions to SIP have been proposed and are being handled in the SIP working group of the IETF As of this writing, numerous revisions have been made to the SIP specification as part of its progress along the standards track from proposed standard to standard In addition, a number of Internet drafts have been prepared that we can expect to be included in the SIP specification in the future or that may become RFCs in their own right The following descriptions address some of the most significant extensions to SIP One example of an extension that has been included within the revised SIP specification is the 183 (session progress) response code, which is typically used to open a one-way audio path from called end to calling end The 183 response is often used when interworking with the SS7 network, where the Address Complete Message is used to open such a one-way path so that ring-back tone can be relayed from the called end to the calling end
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The Session Initiation Protocol (SIP)
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The Session Initiation Protocol (SIP)
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Another addition to the latest SIP specification (RFC 3261) is the addition of the Supported: header field The base RFC 2543 specification includes the Require: header field, which enables a client to specify those extensions or options that a server must support in order to process a request RFC 2543 does not, however, enable a server to independently indicate what extensions or options that it supports Thus, if a client wants to know whether a server supports a given extension, it specifies that extension within a Require: header of a request (such as INVITE) and waits to see if an acceptable response is returned If a 420 (bad extension) response is returned with an Unsupported: header field, then the client will know that the server does not understand the extension or option in question Clearly, this is a cumbersome way of determining what extensions a server does or does not support The Supported: header removes this shortcoming and provides a more elegant means for a client to determine what extensions a server supports If a client issues an OPTIONS request to a server, then the server should include a Supported: header to indicate what extensions it has available The Supported: header can also be used in requests and should be used in requests from a client that supports SIP extensions Associated with the Supported: header is the 421 (extension required) response This response is returned by a server when it requires a particular extension in order to process a request and the request itself did not indicate that the client supports the extension
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The SIP INFO Method
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The SIP INFO method is specified in RFC 2976 This method is a means for transferring information during an ongoing session, such as in the middle of a call Examples of its use could include
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Transferring DTMF digits Transferring account balance information Transferring midcall signaling information generated in another network (such as the PSTN) and passed to the IP network via a gateway
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Through the use of the INFO method, application-layer information could be transferred in the middle of a call, thereby affording user-agent servers, user-agent clients, or proxies the opportunity to act upon the information For example, a prepaid subscriber could be informed in the middle of a call if the subscriber s prepaid account is nearing zero The SIP INFO method is a flexible tool and, as such, does not define the information that may or may not be sent using the INFO method Typically,
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
The Session Initiation Protocol (SIP)
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