Telephone is a softphone for macOS developed by ''64 Characters''. It uses Session Initiation Protocol for communication. Telephone is distributed as free software under the GNU General Public License, GPL-3.0-or-later license.
Audio codecs
* Speex/8000 (narrowband), Speex/16000 (wideband), and Speex/32000 (ultra-wideband)
* Opus (audio format), Opus
* G.711 family codec (PCMA, PCMU)
* G.722
* iLBC
* GSM
References
External links
Telephone websiteTelephone FAQ
Free software programmed in Objective-C
Free VoIP software
MacOS-only free software
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