ISO Logo


typical cHALLENGES

  • Minimum call charges and set up fees
  • Minimal call spend commitment and monthly spend
  • Different call rates to different destinations
  • Care levels
  • Using non-BT Openreach infrastructure

Analogue lines

Analogue lines also referred to as PSTN or exchange lines are the most basic form of telephone line; they are copper pairs of lines running from the telephone exchange to a line box in the premises via a Distribution Point (DP).

This line type can be used as a standard line on its own or for a fax machine, PDQ machine, alarm or lift line. This line is also used to run broadband connections.

Analogue multi-line

Another type of Analogue line is a Multi-Line, also known as Aux lines; they are a number of analogue lines which are grouped together under one telephone number which allow for incoming calls to an engaged line to be passed to the next line available.


ISDN2e is a digital business line that comes in pairs, meaning that they have two channels on one connection. You can add further connections (in pairs) up to eight channels which increases the number of simultaneous connections.

If needed, you can have separate phone numbers for telephones or other devices connected to your circuit. How you do this depends on your line configuration:

  • If you connect devices directly to the circuit, you can have up to nine additional MSN phone numbers which you allocate to your equipment
  • If you use a switch/PBX, you can have an unlimited number of DDI (Direct Dial In) numbers


ISDN30e is a premium digital business line which starts with a minimum of eight channels to a maximum of 30, with the choice of an unlimited number of DDI numbers.

ISDN30e connections are mainly used with a digital switch or phone systems to manage calls more effectively. They can also be used for creating a Wide Area Network (WAN) by linking two or more Local Area Networks (LAN); this allows you to link multiple offices together. The link requires a router at each end to connect the LAN hubs to the ISDN line.

Benefits of ISDN2e and ISDN30e

  • Perform multiple tasks simultaneously - You use the channels of the line separately, which means you can perform different tasks simultaneously
  • Unlimited DDI numbers for easy contact - You can have an unlimited number of DDI numbers; this means anyone dialling in will go directly through to the correct department or person without having to go through a switchboard
  • Get separate phone numbers for each device - If you wish, you can have separate phone numbers for telephones or other devices connected to your circuit
  • Add more connections to suit your business - You can add further connections to your installation, increasing the number of simultaneous calls. Which means as your business grows, your telecoms will grow with you

For help with any of the above, please contact us.

Get in touch

Have a question about this? Please click below to get in touch with an expert.

Contact us

You may also like

The importance of digital transformation and stability in 2020 and beyond.
SME’s represent almost 90% of businesses within the UK, as the COVID-19 pandemic continues, SME’s stability and resilience is being put to the test. The crisis has demonstrated the necessity for digital transformation and a business’s ability to adopt new working practices to ensure ‘business as usual’. Covid-19 has rapidly accelerated...

Read more

Real time cost control for your business mobile portfolio
During this pandemic, many businesses have had to solely rely on mobile communication as their primary communication tool as many employees are now working from home. Mobile communication has never been so important for businesses and as a result many employers are seeing a spike in call and data volumes...

Read more

How to use digital tech to deliver seamless customer service
The ongoing shift to remote working and carrying out our day to day business activities under social distancing measures has seen an increased demand for effective telecommunications, infrastructure and data connectivity. Digital technology has never been more valuable in helping us to remain connected with clients, staff and suppliers and has...

Read more