blind transfer on # (send)

[jolouis]

That's an Asterisk feature (your PBX), not the phone itself.

I have no idea what version of Asterisk you are using, if you're running it yourself or through somebody else, etc but you want to disable (or change the feature code) for Incall Transfer:

http://www.voip-info.org/wiki/view/Aster...tures.conf

Asterisk by default uses # as the in call blind transfer. If you edit features.conf and change it to something else you will solve the problem (usually it's something like ## or *# so you don't trigger it by accident).