CounterPath X-Lite 4.6 for Windows User Guide - Manual (Page 53)

X-Lite for Windows User Guide
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Preferences – Video Codecs
Video codecs describe the format by which video streams are compressed for transmission over networks. Some
codecs require less bandwidth than others, but may result in lower video quality.
You can enable or disable codecs as desired. You may decide to disable a codec even though your VoIP service
provider supports it. With only one codec enabled, all calls made will use that particular compression format.
With more than one codec enabled, X-Lite negotiates a common codec with the other party.
You cannot change the properties of any codecs.