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What does this ERROR message mean?

What does this ERROR message mean?

What does this ERROR message mean?

(OP)
Cause i = 0x81B4 - Service operation violated

I am dialing a specific number from a VOIP phone....  connected to a network with a voice gateway that's connected to a PBX. I dial 9 for my outside line...then dial the number "1-859-816-XXXX" ...as soon as I press the last digit I get a fast busy.  The error is pulled out of the voice gateways debug.  This ERROR seems to be coming back from the PBX.  Any clues?  

RE: What does this ERROR message mean?

(OP)
Found out that this error was a CAS restriction set on the PBX for the specific trunk line.  You can look up the errors by looking a Q.931 call setup errors.  Does ANYONE check these messages?  <sigh>

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