obi200 w/GV: need help to setup answering machine

[AcuraKidd]

I installed obi200 with google voice for grandma, and she use's a traditional panasonic cordless phone with a built in answering machine.

Every time someone calls, it rings and the google voicemail picks up, instead of the built in answering machine.

What settings do I need to adjust to fix this?

[drgeoff]

GV voicemail will pick up a call that is not answered within about 25 seconds.  The time is NOT adjustable nor can it be disabled.  Set the answering machine to answer before that or teach Grandma how to use GV's voicemail.