Codec refers to an encoder / decoder that digitally encodes and decodes data or signals to send over a data network. In VoIP telephony, these play a particularly important role, as they determine how and in what quality audio data and video data are transported within a network. Supported codecs include opus, speex, G.711 (PCMU/A) G.722, G.729, GSM, iLBC, iSAC, L16 for audio and VP8, OpenH264 for audio and video.

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