How to create ip telephony for yourself to make international calls?

Question

JavaScript

Hello, friends! I have a question. How can I make ip telephony to profitably make international calls. For example, no social networks work in my country and I can’t even chat at home. And if he calls directly from the phone, it is very expensive to get out. I know there are sip, voip telephony and there are many companies that provide international calls, but they also charge per minute like a regular number (9-10 rubles min). Please tell me what you can think of. Or how you can bypass network blocking. Everything is blocked there. All VPN-and tried it does not work. How can I create my own ip telephony so that I can set the tariffs myself or call a little cheaper. For example, there are softphones where you can enter the sip login password, then you can make a call, but they are also paid. And how to create such a company so that I can provide such services.

Answer 1

It all depends on your skill level. Raising an asterisk (correctly) without experience can be more expensive.
Raise your telephony server or register a cloud PBX. You register, connect your SIP client to their telephony server, and then it's your choice:
- rent a number from them and call at their rates
- get a few more SIP numbers and register all your close SIPs, calls within one SIP network are free.
- you buy a GSM gateway (for example, goip), install it in the country where you will call (for example, with your parents), connect it to your SIP server, put a SIM card into it and call at the local tariffs of the GSM operator
- you buy an FXO gateway, install it in the country where you will call (for example, if your parents have a home phone), connect it to your SIP server, and call at local rates
Cons
- SIP can block
- SIP want good internet
- SIP eats battery in the background (bria can push, which saves the battery, but the client itself costs money)
- GSM operator does not like gateways, can block SIM
- SIP is constantly broken if you do not set up the correct protection
You can also look towards sip2tg, the project allows wrapping SIP into telegrams.

Answer 2

It would seem, and here Javascript???
If you have a VPN, then try to install Asterisk - this is an ip-telephony server and play around with it. If there is no VPN - only a third-party paid service

Answer 3

If there are few subscribers, then you can, for example, use h323, for example, you can directly use the myphone PC and turn the traffic into ipsec
Or try Voip gateways
Or the same asterisk