I have a Partner R6 and each morning the customer comes in and finds outside lines on hold. Sometimes all lines 1-3, sometimes just line 1. There is a 308EC card and a 2 slot carrier. Their concern is they miss calls until they release the lines. Service is from Verizon fios. no voicemail in the system

I set up a busy lamp on a two 18 button phones but don't see any extensions off hook except for actual phones.

About 5 months ago we put in a whozz calling unit and they believe the lines are going on hold since that unit was put in.