Unable to call home voip phone from my cell phone

About a month ago I was unable to call my home voip phone. I only get a busy signal, but I have no problem calling any other numbers, and no one else is having trouble calling my home phone. Are there any suggestions why this is happening or what I need to do to repair this problem?

Are you able to call your RW phone with the home VoIP phone?

Also, how many digits are you dialing?

I am able to receive calls from home voip and use nine digits when I call

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