There are many Network Services available, but the market place is changing. The most common line types are Analogue Lines and Digital Lines in 2 varieties. Either ISDN2 being 2 digital lines of ISDN30 commonly with 8 or more digital lines. BT has announced they are phasing ISDN2 out so now is a good time to start exploring your options. Due to the cost of ISDN30 and the reduction and increased coverage of fibre optic solutions, many companies now upgrade to Fibre Solutions.