Landline telephone provider provide traditional fixed-line telephony services, and many have also diversified to provide mobile phone services and even TV packages. Large landline telephone providers include Sky, TalkTalk and Virgin Media.
Landline telephone companies connect users by placing voice calls over the traditional phone network, which is also called the public-switched telephone network (PSTN). The PSTN comprises a mix of telephone lines, fibre optic cables, cellular networks and undersea cables, and the core of the network - which used to be analog - is now mostly digital.
Landline telephone providers transmit voice, video and other data over the PSTN using a set of standards and protocols called the Integrated Services Digital Network (ISDN). In the case of voice calls, the ISDN is used to set up a dedicated connection between users for the duration of the voice call.
In the near future, the ISDN will be decommissioned, which will bring a huge change for landline telephone providers. In Germany, ISDN will be replaced by VoIP in 2018, with the UK date set for 2025. This change will impact businesses whose infrastructure relies on ISDN, making a strong case for switching to a VoIP solution such as the NFON Cloud Telephony System.