This is probably best answered by Anthony or Mike J. I need to make extensive use of the "relate" conference API command to eliminate feedback between a bunch of VoIP speakers that have microphone talkback capability. Is there a practical limit on how many "relations" I can set up to mute conferees from hearing each other? I have 16 endpoints in one building and probably 8 to 10 of them need to be muted relative to their nearest neighbors so that list can get fairly large I imagine. I just don't know how far I can push it. Then I have to become a wizard at Lua script programming in a matter of a few hours to make this all work. Pointers to help are greatly appreciated. If I get stuck look for a bounty request :-) I'm thinking I can set up a linked-list populated with the extension number (which I know and is fixed) paired with the conference user id (which varies with each call, but is used by the 'relate' command). I'm just going to make it very simple with everything defined in the script header since it won't change. Once this is done I hope to donate it back to the community in the rare chance that somebody else finds it useful. Thanks! Bote