By default the indicator light at the top right corner of the NEC DSX 22B Display telephone and the NEC DSX 34B Display telephone will flash whenever there are new caller ID records (logs) at that extension. This sometimes causes confusion because this is also the light that flashes when you have new messages in your mailbox.
This feature can be disabled by removing the Caller ID Alert Lamp feature from the class of service. When using the keyset for programming this can be found in 1404-06: Caller ID Alert Lamp
