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Extension lines make calls, but on answering, the call is lost.

Check which COCDECs are configured in your IP extension line.

FXS extension lines use Codec G.711a (ALAW), and calls between extension lines with different CODECs require transcoding.

Configure all the extension lines with the same Codec, so that there is no transcoding during the calls or increase the number of transcoded calls in System > Main Configur.

Check if the extension lines involved in the call have the option of conditioned calls enabled.

Check which COCDECs are configured in your IP extension line.

FXS extension lines use Codec G.711a (ALAW), and calls between extension lines with different CODECs require transcoding.

Configure all the extension lines with the same Codec, so that there is no transcoding during the calls or increase the number of transcoded calls in System > Main Configur.

Check if the extension lines involved in the call have the option of conditioned calls enabled.