I'm getting a random fast busy signal after two rings on an incoming ZAP channel through an FXO interface on a TDM400P. I have a NoOp in the dial plan showing the callerID. When the random fastbusy happens, no CallerID is sent. When it works, the CallerID information is sent. Is this a card issue or a telco issue? I have a very upset client and need to figure out how to resolve this.
Thanks, DR
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