User manual

Four-Channel GSM VoIP Gateway
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3.4.5 Codec Preference
Click on “Media Settings” in the “Call Setting” menu and click Audio Codec Preference to
access the parameters.
Codec Preference allows a user to select the codes to be used and its priority for a voice
call.
Click on the check box to enable a codec. Select a codec and then press the UP or DOWN
button to move the position of the codec on the codec list with a priority in descending
order.
Note: The voice code alaw and ulaw is G.711a and G.711u.