Small companies want VoIP features without vendor lock-in, but open-source systems lack polished admin interfaces.
Create React-based dashboards for Asterisk/FreeSWITCH that handle call routing, voicemail, and analytics. Offer hosted versions for non-technical users.
IT consultants would pay for white-labeled versions to resell to clients. Charge per extension or concurrent calls.
MVP could be a simple call log viewer that plugs into existing installs.
Risk is telecom providers bundling similar tools for free.