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Telephone (application)
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<h2 id="audio-codecs">Audio codecs</h2> <ul><li><a href="/facts/Speex/M7xqnPxN">Speex</a>/8000 (narrowband), Speex/16000 (wideband), and Speex/32000 (ultra-wideband)</li> <li><a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a></li> <li><a href="/facts/G.711/kopBvF25">G.711</a> family codec (PCMA, PCMU)</li> <li><a href="/facts/G.722/z6J1sSuU">G.722</a></li> <li><a href="/facts/ILBC/rPQsKfjo">iLBC</a></li> <li>GSM</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://www.64characters.com/telephone/">Telephone website</a></li> <li><a href="https://www.64characters.com/telephone/faq/">Telephone FAQ</a></li></ul>