OK, it doesn’t matter if you have a Blind Transfer button on your phone or use ##. My question is still valid. Because a transfer (blind or attended) will put the other channel on hold then dial (in your case) what comes after ## for the new channel. You are dialing *110 (even though the call trace shows 101) but your log is saying “0” doesn’t exist. Do you have a feature code set at *11?
People, including myself, have run into this with the Direct Voicemail transfer because it’s just “*” but you have to make sure that when you dial *100 or *212 you aren’t triggering features codes. *10 is speed dial so they could look for entry 0 by mistake. *21 is the FollowMe toggle so it will attempt to toggle FollowMe for 2. In all those cases you wouldn’t be able to dial direct to voicemail.
I change it to *5 because a lot of systems (like Broadsoft, etc) use that code for the function. Many of my users are coming from other providers using systems like that so it was just an easier choice, training wise.
So no feature codes conflicting?