Signal channel
The Signal channel connects a dedicated Signal phone number to the tenant, so that people can talk to OctoMesh from the Signal messenger (questions, uploaded files, answers in the same chat). Each tenant can activate exactly one number; activation registers it with Signal through the tenant's Signal bridge.
The Signal channel is a beta area. The tab Integration > Signal channel only appears when beta features are on for the tenant (Settings > Interface > Beta features). Otherwise its address opens the page "Beta feature turned off".
Without a number the page says "No Signal number activated" and explains that you need a phone number that can receive an SMS verification code and is not used by any other Signal device or bridge. The button Activate Signal number starts the activation.
How the bridge is installed and how a pipeline receives and answers Signal messages is described in the Technology Guide: Signal and its setup.