It depends on how integrated you are asking. I have a Merlin Legend sitting behind an Asterisk system. In other words, my PRI from the telco) is connected to the Asterisk server which is then connected to the Legend. Incoming calls destined for the Legend come into Asterisk and then out the PRI to the Legend. Calls coming out of the Legend go on out to the telco. I guess by dialing 9 plus the asterisk extension, users on the legend could call the asterisk users. Right now, the users on the asterisk system can call the legend users with no problem. As far as any other integration, I really don't need it, so haven't done anything. This is just temporary until I move everyone off the legend onto the asterisk. Then, the legend will just be one big channel bank, I guess.