Oki OKIFAX 5750 Service Manual page 365

30 Speech Receive
31 Option Line Type
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* This setting data must be transferred to the ISDN board.
Determine whether the incoming call is answered when the information
transmission capacity instructed by the network is voice transmission.
1) Setting values
ON (Answered)/OFF (Not answered)
* This setting data must be transferred to the ISDN board.
* This setting cannot be made when ISDN option is not provided.
Sets up the objectives of using option line.
1) Setting value
TX/RX/ALL
TX: For transmission only
RX: For reception only
ALL: For both transmission and reception
* Setting disabled without G3 option.