Services for sending a fax?

Question

SIP

Hello!
Please tell me the tool, service, etc. to send faxes. Yes, there is more. Requirements: SIP, automatic file playback, API. A unique personalized file is sent to a specific number. Mechanics: dial a number, play a greeting, send a unique file, end.

Answer 1

If one stream is enough, you can build on the basis of an asterisk. (You can get 1 competitive fax call from digium for free, you have to buy more.) Use AMI as an API, or even now you can do something via http.
Just choose a provider whose faxes go on t.38.
Personally, setting up such a solution will take me two days. But your rates and your full service. I think any freelancer will do it too quickly enough.