Panasonic KX-TG6561BXT Service Manual page 39

9.1.9. Check Handset Transmission
Check MIC of Handset.
OK
Check CDL TX (HANDSET) in Signal Route.
Cross Reference:
Signal Route (P.17)
9.1.10. Check Handset Reception
Check Handset Speaker in How to check the Handset
Speaker or Receiver.
OK
Check CDL RX (HANDSET) in Signal Route.
Cross Reference:
How to Check the Handset Speaker or Receiver (P.61).
Signal Route (P.17)
9.1.11. Check Caller ID
Check Caller ID in Signal Route.
Cross Reference:
Signal Route (P.17)
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KX-TG6561BXT/KX-TGA651BXT