I swapped out a CP150 in a MICS. I added the mailboxes using the "add many" function. Everything was pretty simple. Now the FastRAD is not answering because when you call the DID the CP answers with the company greeting. This MICS has a PRI. I was having problems figuring out which "lines" to assign to the CP as it was not the first 23. So I just assigned all 500 and it started answering. The DIDs were not changed. I did notice the extension for the CP was not autoassigned a mailbox.