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Callsigns is a Tropo-powered, speech-based callsign lookup application!

Callsigns uses to handle phone calls and as the API to lookup data. Check out the recent blog post about it at It uses the Tropo Scripting API and runs entirely in the Tropo cloud using the following communication channels:

Voice and SMS: 1-480-374-3234

Skype: +990009369991489376


Phono: app:9991489376