CounterPath X-Lite 4.6 for Mac User Guide - Manual (Page 49)

X-Lite for Mac User Guide
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Preferences – Codecs
Audio Codecs
This panel shows all the audio codecs that are included in X-Lite. You can enable or disable codecs as desired.
Typically, leave the enabled codecs list at its default state; only enable or disable a codec if advised to do so by
your VoIP service provider.
With only one codec enabled, all calls made will use that codec. With more than one codec enabled, X-Lite
offers all the enabled codecs and negotiates a common codec with the other party.
You cannot change the properties of any codecs.