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As new header fields are added in various different implementations, developers in other vendors can determine usage just from the name and add support for the field. This kind of distributed, documentation-less standardization has been common in the SMTP, which has evolved tremendously over the years. As SIP is similar to HTTP, mechanisms being developed for HTTP extensibility can also be used in SIP. Among these are the Protocol Extensions Protocol (PEP), which contains pointers to the documentation for various features within the HTTP messages themselves. H.323 provides extensibility mechanisms with some limitations. First, extensions are limited only to those places where a nonstandard parameter has been added. If a vendor wants to add a new value to some existing parameter, and no placeholder exists for a nonstandard element, one cannot be added. Secondly, H.323 has no mechanisms for enabling terminals to exchange information about which extensions each supports. As the values in nonstandard parameters are not self-describing, this limits interoperability among terminals from different manufacturers. H.323 requires full backwards compatibility from each version to the next. As various features come and go, the size of the encodings will only increase. However, SIP enables older headers and features to gradually disappear as they are no longer needed, keeping the protocol and its encoding clean and concise. A critical issue for extensibility are audio and video coder/decoders (codecs). Hundreds of codecs have been developed, many of which are proprietary. SIP uses the SDP to convey the codecs supported by an endpoint in a session. This is due to the differences of ASN.1 versus text. This means that SIP can work with any codec, and other implementations can determine the name of the codec and contact information for it. In H.323, each codec must be centrally registered and standardized. SIP enables new services to be defined through a few powerful third-party callcontrol mechanisms. These mechanisms enable a third party to instruct another entity to create and destroy calls to other entities. As the controlled party executes the instructions, status messages are passed back to the controller. This allows the controller to take further actions based on some local program execution. SIP enables these services to be deployed by basing them on simple, standardized mechanisms. These mechanisms can be used to construct a variety of services, including blind transfers, operatorassisted transfers, three-party calling, bridged calling, dial-in bridging, multiunicast to multicast transitions, ad hoc bridge invitations and transitions, and various forwarding variations.17
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Schulzrinne, Henning, and Jonathan Rosenberg. Signaling for Internet Telephony. Technical Report CUCS-005-98. New York: Columbia University, February 1998.
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Another aspect of extensibility is modularity. Internet telephony requires a large number of different functions; these include basic signaling, conference control, QoS, directory access, service discovery, and so on. One can be certain that mechanisms for accomplishing these functions will evolve over time (especially with regards to QoS). This makes it critical to apportion these functions to separate modular, orthogonal components, which can be swapped in and out over time. It is also critical to use separate, general protocols for each of these functions. H.323 is less modular than SIP. It defines a vertically integrated protocol suite for a single application. The mix of services provided by the H.323 components encompass capability exchanges, conference control, maintenance operations, basic signaling, QoS, registration, and service discovery. Furthermore, these are intertwined within the various subprotocols within H.323. SIP s modularity enables it to be used in conjunction with H.323. A user can use SIP to locate another user, taking advantage of its rich multihop search facilities. When the user is finally located, he or she can use a redirect response to an H.323 URL, indicating that the actual communication should take place with H.323.18 Table 5-5 compares H.323 s call control service with that of SIP.
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