I have a BCM 400 (4.0) system. Need a little help. I have an executive and his assistant. Exec DN is 3405, assistant DN is 3413. I want to have calls going to 3405 ring 4 times on his phone, if he doesn't answer, I want it to go to assistant (3413), ring 4 times on hers then go to 3413 voicemail box. Right now I have forward no answer on 3405 going to 3413. Everything is working except that if both don't answer the call goes to 3405 VM. I want it to go to 3413 VM. How can I do this?