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Remote Mic Key Up Not Working - XPR 7550

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Apr 27, 2011
Atlanta, GA

I own a XPR 7550 with the PMMN4040A remote microphone. When I connect the remote microphone, I can use it to listen and talk, however I have to key up using the PTT button on the portable itself. The PTT button on the remote mic doesn't work at all.

I bought these items together as a kit and verified with my Motorola sales rep that they are indeed compatible devices. They told me that there's a setting in CPS that needs to be toggled to enable the PTT key on the remote mic but wasn't in front of a computer to tell me which option to change.

I went into CPS last night and found the Mic Selection Rule option. There are 3 options:

External PTT Only
Mic Follow PTT

I changed the setting from Default to Mic Follow PTT and that didn't make a difference. My thought process was that the setting implies that both PTT buttons are enabled and that the active mic would be based on whichever PTT button you selected.

I'm about to try the External PTT Only option to see if that makes a difference, but I wanted to check with my esteemed colleagues on the forum before I spend hours trying to figure this out.

Any ideas?
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