I'm having a bit of a problem with my Polycom SPIP 450 phone. First, there is no dial tone. Second, I am unable to enter any numbers after the original number has been dialed. Areas with issues include using digital receptionists and when trying to enter a PIN for a secured conference call (the key presses just don't seem to be registering at all). Has anyone seen this issue before? I tried Google and looking through these forums, but didn't come up with anything useful. Right now, I'm using SP4. I can't be certain, but I believe the problem started occurring after upgrading from SP2. Please let me know if I can provide any further information that might be helpful. Thanks!