Your connection speed (bandwidth) must be sufficiently
high for the type of vocal codec you are using. Vocal
codecs (or just "codec") are the standard
means by which your IP Phone (UA) encodes your voice
and transmits it across the Internet. The codec that
is picked for a particular phone call is primarily
determined by your UA's configured preferences. Consult
your UA's manual to determine how to change codec
preferences.
To use the best quality / highest
bandwidth codecs (G711a/u) we recommend a connection
speed of no less than 90Kb/s in each direction (up
and down).
See the knowledge base article on
codecs for more information.
