I have a Heroku application that binds with a telco sms gateway via SMPP The telco guys need to whitelist IPs for my app to connect. I am aware of the new addon proximo, but it's just insanely priced. So that option is out. Is there a subnet or a list of IPs that I can get whitelisted and is there a guarantee that all requests from my app will originate from tose IPs? I found this https://api.heroku.com/vendor/logplex/whitelist. Is that only for syslog or all apps make a request from one of those IPs?
Thanks
There is now a Heroku add-on that does this called Proximo: https://addons.heroku.com/proximo