T1 - E1 - ISDN30e - ISDN2e and so on

ISDN Home Highway and business Highway was binned off a while ago leaving ISDN2e which can be used for data as per the article or two simultaneous voice calls when connected to the right equipment.

We have lots and lots of customers using ISDN2e lines and use ISDN2e for new installs of telephone systems all the time.

T1 is the US version of our ISDN30e or E1 lines which carry up to 30 x 64kb channels.

I can't see BT killing off ISDN for a long, long time as there are too many people using it for voice.