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3. H.323/SIP comparison
In addition to the fact that H.323 technology is currently much more widespread than IETF technology, there are many points of comparison between the two architectures.
3.1 Philosophy of both approaches
Although the ITU-T and IETF approaches share the same goal in terms of signaling telephone calls and multimedia in general, they differ considerably in the philosophy they adopt.
The ITU-T's approach, although based on the standards it had previously defined for the Integrated Services Digital Network (ISDN), defines a set of new protocols dedicated to Internet telephony (in the broadest sense), as well as the equipment that implements these protocols. In contrast, the IETF's approach is one of maximum reuse: only the SIP protocol is...
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H.323/SIP comparison
The challenges of Internet telephony
References
Recommendations
ITU-T (International Telecommunications Union)
- Call Signalling Protocols and Media Stream Packetization for Packet-based Multimedia Communications systems. - H.225.0 - 2003
- Security and Encryption for H series (H.323 and other H.245 based) Multimedia Terminals. - H.235 - 2003
- Control Protocol for Multimedia Communication. - H.245 - 2005
- Interworking of H. Series multimedia terminals with H....
Documentation source
H.323 architecture
The primary source of information is the ITU-T (International Telecommunication Union). ITU-T recommendations can be obtained via the World Wide Web by consulting the http://www.itu.int/home/index.html server.
IETF architecture
Information on IETF developments...
Internet telephony hardware and software
A large number of telecommunications and IT players have invested in the Internet telephony sector. You'll find offers from VocalTech, Cisco, iFace, Nokia, 3Com, Alcatel, Ascend, Ericsson, Lucent, Motorola, Netspeak, Siemens and more.
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