Below you can find details about BT's Network Description, which provides an overview of BT's Public Switched Telephony Network (PSTN). You can also download the Network Information Publication Principles (NIPP) Annex A and Annex B.
Network Information Publication Principles (NIPP)
NIPP is detailed information about BT's Network that is provided in accordance with Ofcom's Network Information Publication Principles. The information is published quarterly and is only available to registered users.
Operators who have an Interconnection agreement with BT and require access to NIPP should speak to their BT Commercial Manager or Technical Account Director/Manager to arrange access to NIPP.
If you already have access, go to the NIPP Data Files section which is directly below this section.
Please note that this information is confidential to BT and Communication Providers (CPs) with a Standard Interconnect Agreement and must not be disclosed to third parties.