What is ISDN2e and what can I do with it?

ISDN2e is BT's high-performance voice and data service for small offices. With a basic installation you can connect up to eight digital devices and make two calls at once. ISDN also offers 64/128k internet access - useful if broadband hasn't yet reached your exchange.

A two-channel ISDN2e circuit costs about the same as two conventional phone lines, but it offers higher quality and far greater potential.

Below is an overview of what ISDN2e is and what you can accomplish with it. Find out more about the calling features and benefits of ISDN2e, and view our troubleshooting guide.

Using ISDN2e, at what speed should I be connecting to the internet?

What is channel bonding?

What happens to a digital connection if I am using both channels and someone picks up the phone?

Can I use a modem with the digital lines?

Can I use ISDN2e to connect to a customer or supplier who is using an analogue modem?

Can I get a static IP address with my ISDN2e connection?

I have ISDN2e. Can I add more ISDN channels to it?

What is the maximum number of channels I can have using ISDN2e?

How can I tell if I have been disconnected from a call?

What is the line loss limit on ISDN2e?

What signalling type does ISDN2e use?

I need to send some alphanumeric characters down the ISDN line, along with the number that I am dialling. Can I do this?

Can my alarm system run over my ISDN2e line?

Additional support