We are having an issue with FOP2 2.31.07 where the Transfer to Voicemail button seems to be setting DND on extension instead of transferring the call to voicemail. Once set, it cannot be un-set using FOP2, only with *79 from the handset. The handset does not show DND enabled, just FOP2.

We are running FreePBX 10.13.66-15 against Asterisk 13.10.0

Solved: DND toggle is defaulted to *76. Some extensions start with 76xx. So when FOP2 or the ##*ext was sending ##**7642 (for example), it was being executed as son as the 6 was entered as a DND toggle. Disabling that feature in FreePBX solved the problem.