Installing the SIP Media Gateway from BT, a box which replaces the older ISDN box, the cable which connected between the media gateway and the phone system’s ISDN port wasn’t wired like any cable I’d ever seen before.
Wanting to replace the 3m cable BT provided with a short cable to jump the 1U from the gateway to the PBX, I decided to make my own.
It’s not a standard crossover cable, however:
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