Thank s for the responses

Solid State

The old timer had definitely pass on some of his wisdom!

I've no experiences with the yellow jacket relays. Every unit I've seen with these relay base type has had the IBM relays. I will say it is nice when you trace the trouble out that you can see the faulty contact.

Philly
What is the function of the LED? To tell you the coil is energized?

Also, thanks Jim Collett the sequence info for call canceling was spot on!