I am not familiar with this system so have to ask the more knowledgeable people.
Customer has a PRI into the system. He has had a single DID coming in since he purchased the system. He has now started another business. He had a DID ordered and placed on the PRI. The same people answer the telephones for both companies. The problem is that they have to be looking at the phones every time a call comes in to know which company is being called in order to answer it correctly. They would like to find out if the system can do this some how. I do the wiring and do not looking to learn another system so would like to give some detail as to how they can make this work.
Here are some of the ideas I have but not sure if they can have done:
Have the line number ring a different tone on the phones when called in on.
Have a phone sitting in the room with a different tone set on it and assign that line to it and allow the other phones to do a call pickup.
Have a buzzer or such connected to contact closure from the system and have that line buzz it.

Beyond that not sure what the options are.

Thanks for any input you may have.

"It works on our end so it must be fine."