DTMF # key, Cisco Phone

Have a cisco phone and I need to send the # key on some incoming calls to respond to some automated systems.

When the # key is pressed, I appear to lose the connection unless I park the call and pick it back up again. Seems to jump into a transfer mode. My transfer uses the ## for transferring calls.

If I call another system, then I can send the * and # keys no problem.

Thanks,

Brad