No just asking if such a thing is possible if I ever run into a situation down the road where that would be a good idea. I've looked up VOIP PRI adapters on google but they seem rare and quite expensive! What could be done is upgrade PRI to SIP service and use spare CO trunks or add RCOU cards (space permitting) and have that ring a certain extension only. The Cisco SPA adapters activate the FXS port based on the "Resident Online Number" or DID in common terminology.