Codec
From PhonePower Knowledge Base
A codec is a device or program capable of performing encoding and decoding on a digital data stream or signal. Codecs are often used in videoconferencing and streaming media applications, such as VoIP. Within VoIP, a codec encodes voice on one end and decodes it on the receiving end.
Phone Power allows you to specify one of two codecs to use for your calls. The high bandwidth (and thus higher sound quality) codec is G711u. The low bandwidth (and thus lower sound quality) codec is G729a.
