My phone service provider (CallOne) wants to give us a new vPRI with Flex Path. Based on the quote it looks to be an Adtran TA908 (2nd Gen). Currently we have Teltrend dsawm-207alc. I'm not familiar with PRIs at all, and don't really get how they work, which is why I am concerned that swapping the PRI will cause me to have to reconfigure our Patton SmartNode or make changes to our 3CX Manage Console. Would swapping in this equipment necessitate changes in 3CX or on the Patton? What can I prepare for? Our salesman at CallOne doesn’t really “get” 3CX phone systems so he’s not helpful in avoiding potential pitfalls like from yanking out a PRI and replacing it with something completely different. Or maybe swapping the PRI isn't a big deal, provided that it's configured correctly by the installer? Any advice or insights you can offer would be massively appreciated!