This may be something simple that I'm overlooking. When the receptionist is already on a call and another call comes in she puts the initial call on hold or transfers it. When she hangs up, the 2nd call rings in but when she picks up the handset to answer she's connected to the intercom. The red led never moves to the ringing line but remains on the SA button. This just started happening last week. I did notice in the error log that they had a couple of cold starts in the last 2 weeks. Anyone familiar with why this would happen? What am I overlooking? Thanks in advance.

almost sounds like the programming defaulted to a key system

Check to see if the lines are set for no ring at the receptionist's extension. I think they would need to be set for immediate ring.

It's set as Hybrid/PBX in programming and the Operator's lines are set for immediate ring, two of the things I suspected also and checked. I restored from an earlier backup I had saved to my laptop and everything works fine but I'm puzzled as to what had changed. They power the building down once a month so I wonder if there is some software corruption. Thanks for the suggestions guys.

There is a programming option for ringing/idle line preference.

*343 on
*344 off