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Load codeplug and press F4.
Now, go down, highlight the 'Encode sequence', and press F1 (Help).
Your answer is there. I recently programmed a M110 for a customer but there was no need to check this feature.
Wait!... Check that your radio IS programmed with signalling feature. If not, try to change model thru RSS, first.(It is F7 from main menu, labeld 'Radio configuration).