📄 No Caller ID on Analog Lines
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No Caller ID on Analog Lines

Troubleshooting Steps

  1. Verify caller ID service is active with your phone company
  2. Check that the caller's number is not blocked (Private/Restricted)
  3. Ensure phone line goes to LINE IN (not LINE OUT) on the device
  4. Let the phone ring at least 2 full rings — caller ID is sent between ring 1 and ring 2
  5. Try connecting the device directly at the demarc point
  6. Check for DSL on the line — install DSL filters on all devices except the modem

Common Causes

  • Caller ID service not subscribed with telco
  • DSL interference without proper filters
  • Long cable runs (>500 ft) attenuating the signal
  • PBX not passing caller ID to analog extensions