Device Configuration /VoIP 84BEC 6300VNL User ManualMediaMedia offers for kinds of codec, G.711 u-law, G.711 A-law, G.729, G.726, from greatest to lowest inpriority.Phone: Select to set the following configurations for Phone_1 or Phone_2. When phone1 is selected,the following set media codec will be applied to phone_1.T.38: T.38 relay is a way to permit faxes to be transported across IP networks between existing faxterminals. Click Enable to allow transmission of fax over IP network between two fax machines. If T.38is disabled, the analog fax signal is transmitted as the normal audio data. If T.38 relay is enabled, thefax signal is converted to T.38 signal. G.711u-Law: It is a basic non-compressed encoder and decoder technique. μ-LAW uses pulsecode modulation (PCM) encoder and decoder to convert 14-bit linear sample. G.711A-LAW: It is a basic non-compressed encoder and decoder technique. A-LAW usespulse code modulation (PCM) encoder and decoder to convert 13-bit linear sample into 8-bitvalue. G.729: It is used to encoder and decoder voice information into a single packet which reducesthe bandwidth consumption. G.726: It is an ITU-T ADPCM speech codec standard covering the transmission of voice at ratesof 32kbit/s.