If I remember right we could get 64kb/s or 128kb/s if you bundled them, that was in Germany. But also, we didn't have that, we only had a 56kb/s modem and I remember really wanting ISDN when I was a kid :)

ISDN (IDSL) was max 144 kbit/s. Two 64 kbit/s channels and one 16 kbit/s control channel all bundled together.