Letter SMS, is there a manual for dummies?

Question

Telephony

Good day toasters and toasters!
NEEDED: send SMS , where the name of the site (or company, it doesn’t matter) is
written instead of the subscriber number he immediately receives an SMS (where instead of a number - the name of the site). PROBLEM: Rostelecom is asking us (the company) to send data (for distribution) to their server using the SMPP protocol. But there is no manual, or rather there are no concepts - on what to do it, how to send it. THEIR TECH SUPPORT:

A little immersed in the situation. It seems that in order to work with mailing via the SMPP protocol, it is necessary to collect separate VPN tunnels from your vps to our gateway server, and not send them through the public Internet. This is done to protect the transmitted data. Those. now the question is the organization of "transport". Try to connect to a question of experts in networks.

HELP: where do you read about it? How to screw? On what?
here for example on node.js. Ok, I'll do it. But according to the answer (and in the application) they ask for VPN tunnels .. How does it all look?

ps I also need to enter the data in the last column on the right. IP VPS'a is... and the rest where to get?

Answer 1

in the end, it works like this:
Rostelecom provides a login: password , opens access to the ( static you choose ) IP address of the sending server (without IP approval, you will not be able to send SMS) and send SMS from this server via API in a way convenient for you.
With SMPP and IPsec, they were too clever and eventually gave a normal, human REST API

Answer 2

www.ozekisms.com/index.php?owpn=709
from the server, obviously, everything is in the terminal