Polycom 501 doesn't answer incoming call on handset lift

Dear All,

I’m fighting with a strange problem of my Polycom phone running behind an Asterisk server:

When a call comes in on a Polycom phone and one tries to answer the call by lifting the handset, the telephone opens a new line instead of answering the incoming call. The answer the call, one needs to press the “Anwer” button.

I assume that this is more a Polycom than an Asterisk problem, but I’m running out of ideas how to change this behaviour. Which setting? which cfg file?

Any ideas?

Cheers, Fabian