yeah, I finally touched isdn in a commericial way. basic rate or 2 basic rate come in via traditional twisted pair, split off the wall as a bt socket. i talked to the electrician , he change to wall socket to cat5. from there a cable connect it to a NT1 box (of palm size), from the NT1 box , there are two cat 5 outgoing sockets in turn connected to the ISDN adatpor inside the pabx box.
phew .... there is no dial-tone in the isdn wall socket. --- yeah it is the case.
there is dial-tone with the adsl line
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