Any board with the TLU-xx designation, with the xx being specific to the type of PSTN line (ie, analog, digital, tie, T-1/E-1, ISDN, Qsig etc.). Unless you can connect to the PSTN w/IP, then you need an IPLU.
you will need TLU76/1 (prom) for Q931/QSIG, make sure you have correct /prom on the board (do CNBIP:BPOS=x-x-x as /2 and /3 are no good for ISDN signals.
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