No. PRI has nothing to do with BRI. BRI is only available on Mitel ELx system. It is require BCCIII card and Maintenance Module on BCCIII. Has to be software level 2 and higher and it is a special 8 port BRI card. Each BRI(Basic Rate Interface) is a 2B+D port wich is takes 2 56Kbts channels plus 1 16 Kbts D channel. You have to know how it should be programmed to make it work.