Fax configuration - Tones not received by land line

I am trying to configure the Fax Configuration included in FreePBX. I have a number through SIPStation dedicated to fax, and I have fax T.38 enabled on SipStation. I have a configured inbound route with fax enabled mapping to an extension that should accept fax and send to email. The problem is that when I call from a fax machine I get a busy signal. When I call the same number from my cell phone I get fax tones. Any ideas what could be causing this?

I figured it out. I had the Inbound Route set to a fax destination of: Extension>[extension number]. I changed it to: Fax Recipient>[extension setup for fax] and it works perfectly.