H.323 - https://www.chinaroby.com/

 

H.323 https://www.chinaroby.com/

This International Telecommunication Union (ITU) protocol was originally designed to provide an IP transport mechanism for video-conferencing. It has become the standard in IP-based video-conferencing equipment, and it briefly enjoyed fame as a VoIP protocol as well. While there is much heated debate over whether SIP or H.323 (or IAX) will dominate the VoIP protocol world, in Asterisk, H.323 has largely been deprecated in favour of IAX and SIP. H.323 has not enjoyed much success among users and enterprises, although it is still the most widely used VoIP protocol among carriers.

The two versions of H.323 supported in Asterisk are handled by the modules chan_h323.so (supplied with Asterisk) and chan_oh323.so (available as a free add-on).

You have probably used H.323 without even knowing itMicrosoft's NetMeeting client is arguably the most widely deployed H.323 client.

8.2.3.1. History

H.323 was developed by the ITU in May of 1996 as a means to transmit voice, video, data, and fax communications across an IP-based network while maintaining connectivity with the PSTN. Since that time, H.323 has gone through several versions and annexes (which add functionality to the protocol), allowing it to operate in pure VoIP networks and more widely distributed networks.

8.2.3.2. Future

The future of H.323 is a subject of hot debate. If the media is any measure, it doesn't look good for H.323; it hardly ever gets mentioned (certainly not with the regularity of SIP). H.323 is commonly regarded as technically superior to SIP, but, as with so many other technologies, that ultimately might not matter. One of the factors that makes H.323 unpopular is its complexityalthough many argue that the once-simple SIP is starting to suffer from the same problem.

H.323 still carries by far the majority of worldwide carrier VoIP traffic, but as people become less and less dependent on traditional carriers for their telecom needs, the future of H.323 becomes more difficult to predict with any certainty. While H.323 may not be the protocol of choice for new implementations, we can certainly expect to have to deal with H.323 interoperability issues for some time to come.

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