GCC Networks

Using the calculator

Choosing your line type

An analogue line is just a regular BT line as used in countless homes and businesses all over the UK. If you're not sure what type of line you've got then pick this.

An ISDN line is a special digital line used mainly by businesses to carry voice and/or data. ISDN lines support multiple 'channels' per physical line. In the UK BT provides ISDN 2/2e (which supports 2 channels) and ISDN 30/30e (which supports 30 channels).