These are BrandMeister only TAC groups and are not bridged to any other network and never will be. These are specific for users of BrandMeister. Please again refrain from using these as calling channels but for usage when calling on talk groups like 91,93, 3100, etc to move to to continue a lengthy conversation. This allows the high profile/high usage talk groups to be free for others to access and call others for a chat.