4 PRIs yes. 92 concurrent calls, no. There are 60 DSP resources in hardware, each of which can handle one RTP-TDM call. We've never pushed 60 but I seem to recall a couple of DSPs reserved for internal use. T.38 fax is limited to 30 concurrent. It'll do two PRIs plus a handful of FXS ports at the same time just fine.
Also no NFAS. Each physical PRI needs a D-channel.