I have a client with a VVX 400 running 5.4.0.5841 on an Asterisk system. Whenever he is on speakerphone and picks up the handset it ends the call. This obviously makes it very difficult for him to use the phone, he can't even dial a number, press Dial and pick up the handset because that will end the call.
Two things make this especially difficult for me. This guy is technically inept and quite literally a continent away, he's in Oregon and I'm on the east coast. It's been suggested that I try factory resetting the phone but that is going to be tough to talk him through, so before I tried that I thought I would reach out and see if anyone had run into this before and if so whether it was a hardware or software issue and what they did to fix it.