how ??

my grandcentral forwarded to my gizmoproject which is connected with my N800 in accounts.

When someone calls, it forwarded and my N800 rings, when I pickup it says Press 1 to accept the call press 2 to ........

how can I press 1 that time, I have no dialer on the screen, it just have pickup call, end call and speaker ( i guess for mute ). infact after pickup I can't dial 1 either....

anyone?