Go to program No. 3.1 (3.CO -> 1.Line mode)and change "Type" to DIL, Chose the destination for Day, Night and Lunch for CO1.
Do the same for other connected COs.
Also under program No.3.3 (3.CO -> 3.Detail), uncheck the CO that are not connected and you may need to change dial mode to DTMF (This depends on your Telco setting.)
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