We have ISDN at our remote offices and clients for failover in case one of the PVC's goes down. All of these connections from the remote offices are terminating to us on a single ISDN circuit. The problem is that we can only support 2 concurrent dialin because all ISDN connections are Basic Rate.
WHat is involved in switching the circuit that the clients dialin to to a primary rate, so everyone can dial up at one simultaneously? I am assuming that we would have 23 spids (I've never worked on this)? Would the cost of a PRI ISDN line (used occasionally onlly for backup) compare to say a full T1? Suggestions?