There are a few reasons you might hear a busy signal when calling your NumberBarn or NumberGarage number.
First, be careful NOT to call from the same telephone number you are forwarding calls to. For example, if you call from the same mobile phone you are forwarding calls to, your carrier will think you're calling yourself. You may hear a prompt to enter your voicemail password or something of that nature. Instead, call from a separate landline or ask a friend or family member to call your number.
If you're not calling from your forwarding number, you may be hitting your concurrency limit. Please see this article for more information about concurrency limits and how we can help: Simultaneous/concurrent calls
Finally, triple-check that your account is currently active and up to date. If you forgot to update your payment information and your account was suspended, this article will explain your next steps: How can I restore my suspended or deleted account?