Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide
the right answer to your question.
I'm sorry to hear about the problem; it must be quite frustrating to have the phone calling facility disabled this way.
What phone, or phones, and what phone system with how many lines, is concerned with this problem?
The phone on another line works... does the other phone share the same phone number, or is it a different number?
As for whether it can be fixed, what you have described is a fairly common problem, that sometimes happens for various reasons.
(I regret that I am not able to offer Live Phone Call service at this time; However, your request is still open to other Experts in this category, and one of them may pick up on it at any time.)