Integration of SIP Signaling and Resource Management in Visual Studio .NET

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caller for sending a ring tone or music while the called party is alerted At this stage, the dialog is in the early state If the caller wants to change any media parameters, such as the codec to be used, or wants to put the early media on hold, then a re-INVITE will not fill the need Something else is required The solution is the new UPDATE method, which is specifically designed to enable the modification of session information before a final response to an INVITE is received Operation of this extension is simple The caller begins with an INVITE transaction, which proceeds normally Once a dialog is established, either early or confirmed, the caller can send an UPDATE request method that contains an SDP offer for the purposes of updating the session The response to the UPDATE method contains the answer Similarly, once a dialog is established, the callee can send an UPDATE with an offer, and the caller places its answer in the 2XX response to the UPDATE The Allow header (in an INVITE, for example) can indicate support for the UPDATE method, so that one party can know if the other party supports the method One important usage of the UPDATE method is when reserving network resources as part of a SIP session establishment We address this issue next
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Integration of SIP Signaling and Resource Management
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Ensuring that sufficient resources are available to handle a media stream is a very important aspect of providing a high-quality service and is therefore a necessity for a carrier-grade network For example, when a called party answers the phone and attempts to speak, it is imperative that the necessary resources are available to carry that speech back to the caller Equally, resources must be available in the direction from caller to callee Although customers may expect to experience occasional congestion, that experience should only happen while attempting to establish the call Once the far end phone rings and is answered, a customer expects that conversation can take place Anything else is considered defective operation In our discussion so far, we have mainly focused on the signaling related to call setup and teardown The bandwidth required for signaling is miniscule compared to that required for handling the media to be exchanged, however Furthermore, the signaling may take a very different path from the media Therefore, we cannot assume that the successful transfer of sigDownloaded 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
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The Session Initiation Protocol (SIP)
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The Session Initiation Protocol (SIP)
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naling messages will automatically lead to a successful transfer of media If carrier-grade operation is desired, the signaling must accommodate some mechanism to ensure that resources are available in the network for the transport of the required media As we shall describe in 8, Quality of Service, resource reservation can be achieved either on a per-session basis or on an aggregate basis On a per-session basis, end-to-end network resources are reserved in real time as part of session establishment On an aggregate basis, however, a certain amount of network resources are reserved in advance for a certain type of usage, and network resource utilization is constantly monitored If a session is to be established under such circumstances, it is simply necessary to check that the resource demands of the new session will not cause the total usage for sessions of that type to exceed any pre-arranged reservation For example, if an IP network were used to carry voice, user data, and management traffic, then it would be common to reserve a certain percentage of resources for voice, a certain percentage of resources for user data, and a certain percentage of resources for management traffic The management of access to those resources takes place at the edge of the network Therefore, if a new voice session is to be established, policing functions at the edge of the network are invoked to verify that the new session would not cause the total usage to exceed any prereserved maximum Since two main approaches to network resource reservation exist, any SIP solution for resource reservation must be compatible with both approaches In other words, SIP-related resource reservation must work in a regime where resources are reserved on a session-by-session basis and must also work in a regime where resources are reserved in advance and where new sessions are allowed only if total usage does not exceed a prereserved maximum The remainder of this section addresses a SIP extension that supports both regimes An Internet draft was prepared in 1999 describing a means for reserving network resources in advance of alerting the called user The draft specified the use of a new SIP header to be used in the INVITE, indicating to the called end that resource reservation is needed and that the user should not yet be alerted After successful resource reservation, a second INVITE would be issued to set up the call This approach, however, had some incompatibilities with standard SIP If new headers were not supported by the called end, a call could be established without sufficient resources, since SIP states that new unrecognized headers should be ignored Consequently, the extension was rejected The basic need was recognized, however, and several groups have worked for some time to define a new Internet draft to address the issue in a different way That draft is titled Integration of
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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
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The Session Initiation Protocol (SIP)
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