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Cisco IP Phone Audio Codecs - Global Knowledge
https://www.globalknowledge.com/us-en/resources/resource-library/articles/cisco-ip-phone-audio-codecs/
All 7900 series Cisco IP phones support the G.711 and G.729 audio codec. G.711 is a 64kbps audio codec that has been used on the public switched telephone network (PSTN) for many decades. G.711 is considered a toll quality audio codec.
Codec Support FAQ - Cisco
https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/41386-codec-faq.html
These audio codecs are supported for use with all versions of Cisco Unity: G.711 u-law and a-law. G.729 Annex A (G.729A) at 20 ms packetization rate ONLY. Cisco Unity TAPI Service Provider (TSP) 7.0.3 and later supports g.729a from 10 ms up to 60 ms packetization rate. Intel Dialogic OKI ADPCM 8 kHz. Intel Dialogic OKI ADPCM 6 kHz. GSM 6.10.
Summary of CUCM Supported Codecs - Cisco Community
https://community.cisco.com/t5/collaboration-voice-and-video/summary-of-cucm-supported-codecs/ta-p/3162905
If G722 Codec is disabled, Advertise G722 Codec enterprise parameter is ignored . G.722.1: A low-complexity wideband codec operating at 24 and 32 kb/s. G.723.1: Low-bit-rate codec with 6.3 or 5.3 kb/s compression for Cisco IP Phone 12 SP+ and Cisco IP Phone 30 VIP devices. G.728: Low-bit-rate codec that video endpoints support.
Audio Format in Cisco Unity Connection 8.x - Cisco …
https://community.cisco.com/t5/collaboration-voice-and-video/audio-format-in-cisco-unity-connection-8-x/ta-p/3113896
Cisco Unity Connection supports a number of different codecs, as described in the following sections. G.711 Codec The G.711 codec is the most used and supported codec in IP telephony. It is produced using pulse code modulation at an uncompressed sampling rate of 8000 samples per second.
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