It would really help to know what type of Nortel system and voice mail system you have...any documentation or description you could provide would help us help you....but in the end it would likely be easier for you to get a tech to help you, plus the problem would be fixed by now.
An hour or so and a tech could likely fix this, unless there is more to it than what we know from your post. If a tech had added the line in the first place none of your clients would have been upset.......and you are likely loosing more money by not having the system work properly than it would cost to have a tech fix/install this...but that is a value decision your boss has to make.
Steve
