Is there a way to have a private line on a partner ACS Ver 3 with a Voice messaging PC card so that when a certain number is called, it rings only to that ext and gets that ext mailbox? I know I can get in to line access and turn that line off at all ext's but I'm having trouble getting it to go to the voicemail box of the correct ext. They want to dedicate line 4 for a separate business. Thank you.