Yes. Thanks. I have another company that I use WHMCS, soon I will make a test with the module.We currently have 2 API providers, Nexmo and Twilio - if that is what you meant by SMS transmission business?
Currently only WHMCS, will look into Blesta if there is a larger audience.
About Blesta, there is a good 'crowd'. Make a topic in Blesta Community, you will see that there are many stakeholders.