I have a C-2000B with four E-30 call boxes. The C-2000B is in the “Analog Station” mode with dial-tone connected to screw terminals 6 and
7 of the C-2000B and dip switch 5 is set to on for the analog station mode. The E-30’s are programmed to dial a phone number and they dial out
properly if connected directly to the dial tone. When the E-30’s are connected to the C-2000B and an E-30 tries to dial out, I hear the dial tone and
it tries to dial but then I hear 3 beeps and the E-30 disconnects. What could be the problem?