G.729, G.722, and G.723.1
Transcoding to and from (i.e. encoding and decoding) these formats is thought to be covered by a patent.
Some other uses of these formats are outside the scope of the patent. For example, the Asterisk PBS software has a "pass-thru" mode which transports G.729 audio without transcoding it, and this is considered safe from patent risk.
Projects harmed by these patents include freeSWITCH and Asterisk PBX.
 Related pages on en.swpat.org
- Harm to standards and compatibility
- Free software projects harmed by software patents
- Mp3 - another format, useful for telephony but hampered by patents
- http://www.sipro.com/ - a patent cartel that tries to collect money from developers who need to use these codecs
- "0005697: Choppy Audio When Using > 20 MS Audio Frames". https://issues.asterisk.org/view.php?id=5697#c36150. "The G.723.1 codec is not distributed with Asterisk, as it is under patent protection."
- "0005084: [patch Simple G.722 pass-through addition"]. https://issues.asterisk.org/view.php?id=5084#c44350. "Patent issues doesn't matter, because tihs code not add transcoding.This support done like G.729 support."
- "Re: [sipX-dev Critical Problem : No MOH on transfer when G729 is selected on call setup."]. http://list.sipfoundry.org/archive/sipx-dev/msg22601.html. "Why is G729 not enabled by default for freeSWITCH ? ... One word: Patents"
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