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The information contained in the NICC Standards published on this site were accurate at the time of publication. However, there are some details in older NICC Standards that are now out of date, for example –
• Crown Copyright
• Addresses, including those for Ofcom and The IET.

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Private Network Signalling Specifications

ND Number Version Title
ND1301 Issue 7 Digital Private Signalling System No 1 (DPNSS 1) Download
ND1302 Issue 4 Interworking Between DPNSS 1 and Other Signalling Systems Download
ND1303 Issue 2 Interworking Between DPNSS 1 and ISDN Signalling Systems Download