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Northern Ireland’s Preferred Business Supplier

Clarity Telecom provides landline services to thousands of business customers throughout the UK and Republic of Ireland. Below is a brief description of some of the services we can deliver.


Single Line PSTN

This type of line is what you will see in most homes and businesses it is known as a PSTN line. It is these lines that can be used in conjunction with ADSL or FTTC to supply broadband connectivity to your premises. Clarity can provide new analogue lines in as little as 24 hours*. Should you require more than one call on the same phone number, you should also consider PSTN Multi-lines or ISDN telephone lines.

*Subject to survey


Suitable for medium and large business users each ISDN30 bearer is supplied with a minimum of 8 channels and a maximum of 30. Multiple bearers can be supplied to support 100s of channels. ISDN 30 lines have applications for handling individual calls as well as combining them for high bandwidth applications such as video conferencing or the transfer of large files.

Multi-line PSTN

Multi-lines differ from single lines in as much as they can’t support broadband. However, what they can deliver is one phone number, but multiple lines to call out on, or receive calls through. A basic phone system can be used for call handling on a Multi-line, which can work out cheaper than the equivalent ISDN solution


Available on ISDN2 Digital System and ISDN30, DDI numbers can be used by customers dialling in and get directly through to the right person or department without having to navigate a receptionist or switchboard.


Suitable for small and medium business users, ISDN2 Lines come as ISDN2 Digital System and ISDN2 Digital Standard.

Digital System lines must be connected to an ISDN capable Phone System to work correctly. The Phone System or PBX is programmed to handle calls as required.

Digital Standard lines are typically used for data applications owing to the inability to support line hunting or multiple channels beyond the initial 2.

Supplied & Supported by Openreach

The land lines we provide in the UK are supplied and supported by Openreach. Openreach are part of the BT Group, but are heavily regulated to ensure that no one provider has an advantage over the other. As such we buy our lines and support from Openreach on the same basis as everyone else. No competitor can deliver or support lines quicker than we can.

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To find out what other landline services are available contact us.

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