CounterPath Bria Android Edition 2.2 User Guide - Manual (Page 55)

Bria Android Edition User Guide
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Audio Codecs Selection
Codecs are programs in Bria involved in transmitting audio; each codec has different characteristics and
therefore each works better in some situations than in others.
In general, it is desirable to have several codecs enabled. Make sure that there are common codecs between you
and the remote peer, otherwise your call will fail with a 488 error.
Novice and Non-technical Users
We recommend you use the default setting/priority and let Bria select the best codec to use in a given situation.
Technically Savvy Users
You may choose to enable one, some or all codecs. If only one codec is enabled, all calls will be made with that
codec. If more than one is enabled, Bria negotiates the codec to use (from among the enabled codecs) with the
other person. If no codecs are enabled, Bria uses G.711u.
You can prioritize codecs by tapping the Up or Down icon in the list. Codecs higher in the list are given a higher
priority in the offer, when negotiating codecs with the other party. Therefore, moving a codec higher should
improve its chances of being chosen.
G.722, AMR-WB and SILK-WB are wideband codecs. All other codecs are narrowband. When a wideband
codec is used, data usage will be higher and audio quality will generally be better. When a narrowband codec is
used, data usage may be lower but audio quality may be affected.
The optional G.729a codec will provide you the best performance (audio quality and bandwidth usage/cost)
when using mobile network for phone calls.