I have 1 3904 phone that has 3 numbers on it 1000, 1001, 1002. I have three other phones that back up just the 1001, and 1002. They do not want to answer the calls until it hits the 'rollup' line. I am trying to ring the main number (1000) then no answer to 1001 which shows up on all phones, then no answer to voicemail. I can get it to go to 1001, but not go back to voicemail. I usually dont have to post because i can find my answers through searches but could not find this one.