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A PSTN subscription is equivalent to a main line to own end-user where subscriptions for analogue telephony are supplied. The operator that has customers with subscriptions usually owns the main line or leases the main line from a network operator (for example by full or shared access) or buys Wholesale Line Rental (WLR). An indirectly connected customer, i.e. pre-selection customer or prefix customer, is not included here.

An ISDN subscription is equivalent to a main line to own end-user comprising either basic rate or primary rate ISDN. The operator that has customers with subscriptions usually owns the main line or leases the main line from a network operator or buys Wholesale Line Rental (WLR). An indirectly connected customer, i.e. pre-selection customer or prefix customer, is not included here.

IP-based telephony describes an ordinary telephone which is linked to a broadband connection via, for example, a terminal adapter. Alternatively, an IP telephone or the corresponding is used, which is linked directly to a broadband connection. PBXs that are connected via IP protocol have also been included.

Date of release is date of access

PSTN and ISDN merged in 2022