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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
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