atcomsystems.ca/forum Forums TDM Business Telephone Systems Inter-Tel Telephones & Systems Mailbox to outside line (primary message notification) not working after switching providers

So after swapping things around, I found that swapping back to a certain phone number on our old provider, it works again. So I have 2 different phone numbers than what the Intertel system is expecting I guess? Is it hard coded in the system to only use a certain phone number? I was running on the assumption that it just picked the first available line to go out on.