Products & services

BannerISDN30e line


Faster connections and more digital services

ISDN30 and ISDN30e give you crystal clear call quality for up to 30 phone lines. They’re ideal for businesses with more than eight phone lines and you can use them for connecting people in small offices or at home.

Get call quality
ISDN30 and ISDN30e are high-performance voice and data services. Digital technology gives you great line quality, almost instant connections and crystal clear calls with other ISDN users. Of course, you can make and take calls to and from analogue systems.

Data gets through fast
You can depend on fast and error-free data transfer every time. Each ISDN30 connection gives you between eight and 30 independent 64k channels. You can combine them for bandwidth-hungry applications like high-quality video conferencing or transferring big data files. ISDN is also great for wide-area networks linking different offices.

Numbers for all your staff
All your people can have direct dial numbers, so callers don’t have to go through a switchboard.

What it costs

Costs depend on how big your organisation is and how many lines you need. There’s also a chance to cut your costs with BT Accumulate and make savings on calls by buying alongside one of our great value call packages like BT Customer Commitment or Premier Value.

To find out how much you could save, click ‘Get a quote’ on the right.

The right service at the right price

We have unrivalled experience and services to meet all your needs. That includes basic business phone and ISDN lines, along with value-for-money discount packages. You can also use our market-leading analytical tools, to help you control your costs and plan for the future.

Technical specs

Versatile digital connections

Up to 64 channels - and as many numbers as you like
With an ISDN30/30e connection you can have between eight and 30 64k channels and use them separately for simultaneous calls over each one.

You can add more connections for more simultaneous calls and/or data bandwidth.

A choice of diversion options helps to keep your business running if there’s a fault.

And you can have as many DDI numbers as you like, so callers can get straight through to your people without having to go through a switchboard.

Choose your equipment
With ISDN 30/30e there’s a wide choice of digital switch or PBX equipment plus phones, faxes and ISDN cards for computers.

Connect to the net
If you don’t have ADSL you can connect to the internet at 64kbps with a single ISDN channel, or at 128kbps with two together.

Presentation Number
Presentation Number is a digital calling and network feature that allows an additional number to be sent along with a customer’s default network Calling Line Identity (CLI) on their outgoing calls. When an outgoing call is made by the customer, the person they are calling will be able to see the Presentation Number on their Caller Display and not the actual (network) line number. If the called party misses the call and subsequently dials Call Return on 1471, they will only hear the Presentation Number.

There are various types of Presentation Number types available on ISDN30e (types 1 to 5).


Digital phone lines across the country

ISDN30e is available in most of the UK. We’ll need to do a survey to make sure we can provide it to you.


Great for voice, data and video

You can use ISDN for voice calls and high quality data links with other ISDN subscribers, including overseas. Digital connections are ideal for video conferencing, linking Local Area Networks (LANs) at different sites, and transferring large files securely.

Service Level Agreement

Service care

With all our Business Exchange lines, you’re automatically covered with Prompt Care. But you can also choose Total Care and Critical Care, depending on what maintenance cover you need.

Prompt Care

Reporting faults
You can report faults around the clock, Monday to Saturday. We’ll respond within four working hours and start investigating. Once we’ve confirmed it’s a fault, we’ll give you a reference number and tell you what progress we’re making to fix it.
We can divert your line to another number if you need us to.

Engineering visits
Our engineers will visit between 08:00 and 18:00, Monday to Saturday (except public holidays).
For an extra charge, we can work outside these hours if you need us to.

Fixing Faults
We’ll fix faults by the end of the next working day.

Total Care

Reporting faults
The same as Prompt Care, but you can report faults around the clock, seven days a week, including public holidays.

Engineering visits
Our engineers can visit seven days a week, between 08:00 and 18:00 (including public holidays). We may be able to arrange appointments from 07:00 and until 21:00 if you need them.
For an extra charge, we can also work outside these hours if you need us to.

Fixing faults
We’ll fix the fault within 24 hours of you reporting it, unless you make an appointment outside that time frame.

Critical Care

Reporting faults
The same as Total Care.

Engineering visits
Our engineers can visit any time you need them, including public holidays.

Fixing faults
We’ll fix the fault within six hours.

With all three levels of cover, if we don’t fix the fault within the target time, you can claim under our Customer Service Guarantee scheme.