The following voice codecs are supported by your phone:
Excellent voice quality. The broadband speech codec G.722 works at the same
bit rate as G.711 (64 kbit/s per speech connection) but with a higher sampling
rate. This allows higher frequencies to be played back. The speech tone is therefore
clearer and better than for the other codecs (High Definition Sound Performance).
G.711 a law / G.711 μ law
Excellent voice quality (comparable with ISDN). The necessary bandwidth is
64 kbit/s per voice connection.
Good voice quality (inferior to that with G.711 but better than with G.729).
Your phone supports G726 with a transmission rate of 32 kbit/s per voice
Average voice quality. The necessary bandwidth is less than or equal to 8 kbit/s
per voice connection.
To save additional bandwidth and transmission capacity, on VoIP connections
that use the G.729 codec you can suppress the transmission of voice packets in
pauses ("Silence Suppression"). Instead of the background noises in your environment,
your caller then hears a synthetic noise generated in the receiver
(option: Enable Annex B for codec G.729).