ISDN lines

From basic ISDN lines, to multi-channel ISDN30 solutions for businesses

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Reliable connections for voice and data

Integrated Services Digital Network (ISDN) is a high-performance service that delivers broadcast-quality voice and continuous, extremely reliable data transmission.

Continuous data transmission makes it ideal for use with EPOS machines and intelligent tills in shops. And that makes it especially useful in areas with patchy broadband coverage.

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ISDN2

For small businesses that can’t afford any breaks in data transmission. With ISDN2e System you can connect to a small switch (like Avaya IP office) with up to 60 channels. Channels are sold in pairs and can be bonded to increase bandwidth for things like reliable video conferencing.

ISDN30

For large businesses that need high-quality video conferencing, consistent transfer of large data files, or that operate call centres. Customers get an unlimited number of channels (sold singularly) and can also bond channels to increase bandwidth. ISDN30 supports WAN to link two or more sites. 

Included as standard

Help and support

We will aim to fix your phone line fault by the end of the next working day.

You can report faults 24/7/365 online or by phone:

ISDN2 & ISDN2e system call - 0800 800 154

or

ISDN30e call - 0800 154 434

But you may not need to contact us at all: our comprehensive set of FAQs and help articles on our website, plus help from other customers on our support forums,  should answer most questions.

Optional extras

ISDN30 Assurance Continuity: alternative and diverse routing

Protection against both cable and local exchange failure.

  • We provide your ISDN over 2 different routes
  • Different cables, ducts (where available), and building entry points
  • Routing from 2 exchanges to your premises 

ISDN30e Assurance Continuity: site assurance option 1

If your site has been compromised, we’ll divert all your incoming calls to a single pre-arranged number.

ISDN30e Assurance Continuity: site assurance option 2

ISDN30e channels duplicated at a standby site that we activate when you can’t use your main site.

ISDN30e Assurance Continuity: dual parenting

We connect your site to 2 exchanges with the same number range across both exchanges.  

So if one exchange fails, you’ll still get your incoming calls delivered from the second exchange. 

Add more DDI numbers to your ISDN30e

If you’d like to add direct dial in numbers to your lines you can upgrade from £3.40 per channel per month  (ex VAT)
.

Faster fault fix

2 options for more rapid fault fixes.

Total care

We will aim to fix any faults within 24 hours of you telling us about the fault (including weekends and public holidays).

Costs  

ISDN2 and ISDN2e System: £4.70 a month extra for each pair of channels (ex VAT)

ISDN30e: £3.00 a month extra (ex VAT)
 for each channel 

Critical care

We will aim to fix any faults within 6 hours of you telling us about the fault (including weekends and public holidays).

Costs 

ISDN2 and ISDN2e System: £6.30 a month extra for each pair of channels (ex VAT)

ISDN30e: £4.30 a month extra for each channel (ex VAT)

Increase your call allowance

Save money by increasing your call allowance.

ISDN2

  • Inclusive call allowance of £20 a month – from an extra £13.20 a month (ex VAT)
  • Inclusive call allowance of £40 a month – from an extra £27.50 a month (ex VAT)

 

Why BT Business?

Unlimited calls

Unlimited UK calls for just £12 a month

Over 900k customers

More UK businesses trust us with their communications

Round-the-clock support

24/7 online fault reporting and service status

Techie stuff

ISDN2

Technical details about ISDN2.

  • Internet connection speed on each channel is 64kbps, which you can combine for faster transmission
  • If you connect devices directly to the ISDN circuit, you can have up to 9 additional MSN (Multi-Subscriber Numbering) numbers

ISDN2e System

Technical details about ISDN2e System.

  • If you connect devices directly to the ISDN circuit, you can have up to 9  additional MSN (Multi-Subscriber Numbering) numbers
  • Internet connection speed on each channel is 64kbps, which you can combine for faster transmission
  • Bond channels together for faster transmission for high-quality video conferencing and transferring large data files
  • If you use a switch (PBX), you can have an unlimited number of DDI numbers (extra charges apply)

 

ISDN30e

Technical details about ISDN30

  • Each bearer carries 30 64kbps channels
  • Bond channels together for faster transmission for high-quality video conferencing and transferring large data files
  • If you use a switch (PBX), you can have an unlimited number of DDI numbers (extra charges apply)
  • You can create a Wide Area Network (WAN) by linking 2 or more Local Area Networks (LAN) so you can link multiple sites together
  • 2 configurations available: ETSI and DASS

 

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