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3G-324M Activity Group

This group performs interoperability tests for realtime videotelephony according to the standards H.324, 3G-324M (TS. 26.111, TS 26.110, TR 26.911). Its main focus is interoperability testing of 3G-324M terminals.

What We Do

We verify standard interoperability of H.324, H.324M and 3G-324M products and organize face-to-face and virtual interoperability tests.
We provide feedback for improvements to local and global standardization bodies such as ITU-T or 3GPP.
We keep members up to speed with latest industry developments and encourage use of reflectors for e-mail discussion on implementation issues.


The IMTC collaborates and has liaison relationships with several standards development organizations. Learn about the liaison activities this group is maintaining with external organizations.

Collaboration Method

We hold weekly conference calls and virtual interoperability events as well as face-to-face interoperability events.

To participate, your company must be an IMTC member in good standing and a developer of H.324/3G-324M terminals.

How to Join

To subscribe to the Activity Group’s email list, scroll to the top of the page and click on the “Member Login” button to access the member portal, then select “Join a Work Group”, select the Activity Group and click on the “subscribe” link. You will receive a subscription confirmation in your email. If you have forgotten your password, click on the “Forgot/Need Password” on the sign in screen and it will be emailed to you. If you have not set up a user name and password or have any questions, contact the IMTC help desk at This email address is being protected from spambots. You need JavaScript enabled to view it." style="color: #37296d;">This email address is being protected from spambots. You need JavaScript enabled to view it..

Member Companies

EricssonNokiaNXPPacket VideoQualcommAvaya, Samsung


For discussion on H.324, H.324M and 3G-324M, join the H.324 interoperability mailing list.