TM Forum Open APIs

A portfolio of standardized, REST-based APIs developed by TM Forum to enable interoperability between BSS, OSS, and partner systems. TM Forum Open APIs cover product catalog, ordering, billing, customer management, service inventory, and network operations. These APIs facilitate rapid integration, reduce development costs, and enable digital ecosystem collaboration.

Categories: Protocols and StandardsOperations and Business

TM Forum Open APIs in context

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how they interlock, is essential for both design and audit work.

OSS/BSS platforms hold the highest-value subscriber and revenue data on the operator side, are heavily targeted for fraud and insider abuse, and are in scope for NIS2 and the UK Telecoms Security Act.

To place TM Forum Open APIs in the wider telecom-security picture, review 3GPP, Charging System, eSIM (Embedded SIM, eUICC), IP, MAC Address and Patch — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.