The Home of telecommunications network and service interoperability standards

Why does the UK need NICC standards?

NICC Standards Limited provides technical interconnect and interoperability standards that enable successful UK telecommunications calls, sessions and connections in an ever complex and fast-moving communications environment.

Tell me more

Working to reduce and prevent scam calls reaching customers

NICC is working closely with Ofcom to reduce and prevent scam calls reaching customers.

Tell me more

Guiding Lifesavers to You

Delivering emergency calls is critical to saving lives. Having accurate caller location information greatly improves the response time of the Emergency Service. NICC is working to enhance automatic delivery of location information from anywhere in the UK and from any customer device.

Tell me more

The clock is ticking!

Take action now to stop devices & calls failing!

Tell me more

NICC current work

NICC specifications are being developed for the following technical activities and interfaces:

  • Ensuring interoperability of IP networks and service, developing signalling protocol interfaces
  • Stopping nuisance calls, managing CLI rules and implementation guidance
  • Delivering emergency calls over the network
  • Providing customer and network protection guidance
View all work

Latest Publications

Download ND1526 Report containing the options to support the verification of mobile roaming calls
ND1526
Report containing the options to support the verification of mobile roaming calls
Download ND1034 UK SIPconnect Endorsement
ND1034
UK SIPconnect Endorsement
Download ND1445 All IP Telephony Industry guidance and Lessons Learnt
ND1445
All IP Telephony Industry guidance and Lessons Learnt
Download ND1442 SIP Implementers' Guide
ND1442
SIP Implementers' Guide
Download ND1448 Guidance to Providers on interpretation of the terms PECN and PECS in relation to the Telecommunications (Security) Act 2021
ND1448
Guidance to Providers on interpretation of the terms PECN and PECS in relation to the Telecommunications (Security) Act 2021
Download ND1035 SIP Network to Network Interface Signalling
ND1035
SIP Network to Network Interface Signalling
Download ND1016 Requirements on Communications Providers in relation to Customer Line Identification display services and other related services
ND1016
Requirements on Communications Providers in relation to Customer Line Identification display services and other related services
Download ND1214 UK Requirements for a Common Database
ND1214
UK Requirements for a Common Database
Download ND1657 SIP Overload Control
ND1657
SIP Overload Control
Download ND1431 Guidance on CPE Compatibility for All-IP Telephony Networks
ND1431
Guidance on CPE Compatibility for All-IP Telephony Networks
Download ND1132 Guidance for the transport of data in an All-IP Telephony world
ND1132
Guidance for the transport of data in an All-IP Telephony world
Download ND1704 V4.2.1 End-to-End Network Performance Rules & Objectives for the Interconnection of NGNs
ND1704 V4.2.1
End-to-End Network Performance Rules & Objectives for the Interconnection of NGNs
Download ND1447 V1.1.1 Guidance on blocking of inbound international calls with UK Network Number as CLI
ND1447 V1.1.1
Guidance on blocking of inbound international calls with UK Network Number as CLI
View all publications

NICC Open Forum

The 2024 NICC Open Forum will take place on the 13th November 2024. The slides from the 2023 NICC Open Forum are now available.

Please following the link below.

View all events

About NICC

NICC Standards Limited is a technical forum for the UK communications sector that develops interoperability standards for public communications networks and services in the UK. It is an independent organisation owned and run by its members.

It is now necessary to be a member to participate in NICC activities. Learn more about NICC membership.

Tell me more