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.)
Which is another number, please? the phone on another line that works? or the phone with the problem?
Is there only one phone station to a line, on your phone setup and system?
Are both numbers from the same provider or phone company? or are they from different companies?
Are both lines/numbers, running through the same phone system box? (That's a box that all lines in an office generally run through. Usually it is kept in a back room, or an equipment closet.)
The phone system doubtless has lost some of its configuration and will need reprogramming, for the second line to respond properly to incoming calls.
Reprogramming the phone system will require the administrator code or administrator login for the phone system.
Given that you can dial out on the problem line, the actual infrastructure is OK: the phone station, the phone line cabling, the electronics of both of those. It's a matter of the internal 'switching' or configuration and responses of the phone system box and its details of programming, by the sound of it.
Can I instruct you in the details of programming your phone system? I cannot, I must admit. So I have Opted Out, opening this case to other Experts in this category.