The Operator User Association (OUA) is a forum for knowledge exchange between operators and users of TETRA systems. The OUA carries the responsibility of collecting and submitting user priorities to the Technical Forum.
The Applications Working Group (Apps WG) brings together users, application developers and equipment manufacturers interested in data applications on TETRA networks. The Apps WG collects and organizes requirements and provides a place to discuss data applications, the sharing of experiences and best practices.

The Rail Forum provides a platform for everyone interested in TETRA implementation on railways. Participants share experiences and information, focusing on the railway market’s potential for future TETRA projects, the use of TETRA in signalling on long-haul lines, and the collation of case studies to aid marketing. Current members include consultants, suppliers and rail operating companies.

The Security and Fraud Prevention Group (SFPG) produces advice and technical reports and makes recommendations. If complied with, these ensure that the TETRA security features used in equipment supplied by different manufacturers are optimally and securely implemented whilst supporting interoperability.

The Technical Forum (TF) provides a general forum for exchanging technical knowledge. It develops and oversees the TETRA interoperability testing and certification process. This enables TETRA equipment from different suppliers to work together. The TF gathers users’ and operators’ priorities for technical developments and co-operates with ETSI, which maintains the TETRA standard.

The TETRA Small and Medium Enterprise Forum (SME Forum) provides a mechanism for the small and medium enterprise TETRA manufacturers to ensure that their interests, views and proposals are noted by the TETRA Association’s board, forums and working groups. Examples include the recommendation of and participation in association events and the discussion and sharing of knowledge and concerns about the essentiality of patents for TETRA.

The TETRA Association Marketing Group drives the integrated marketing communications activity, defining the positioning and raising the profile of the association. Members are welcome to participate, and a marketing background is not essential. The required qualifications are common sense and the ability to deliver on commitments.

A number of other TETRA Forums have a membership specific to a country or region. They provide a platform for local technology promotion and also support association initiatives to help national members to gain maximum benefit.