How to set up calls from one SIM card to several phones?

Question

Android

Hello. I want to use all the accumulated phones. Please tell me how to set up call forwarding from a SIM card to IP telephony.
We have: - one working SIM card, the number of which cannot be
changed - a home server - a
pack of phones of various configurations on android - 4g
huawei mobile router,

as far as I understand, it will be necessary to purchase a gsm voip 1 gateway. The scheme comes out: sim card - gateway - server with asterisk - sip (voip?) client
tell me if I'm going in the right direction, are there any tips

Answer 1

The direction is correct.
You need a gateway, from the available ones I would recommend GoIP. Telephony server (can be an asterisk). And think about how you will receive these calls (through which channel).
- via SIP, we need a SIP client, for android I would recommend Bria, it has a push mode that saves battery, but the client costs money (you can find a broken version on w3bsit3-dns.com, it works on 10 buckets).
- via GSM, you will need another SIM or SIP line from some provider.
- you can wrap calls in Telegram.
If you use GSM, you need to think about how you will see the subscriber's number, because. in fact, you will see the number of the outgoing channel. You can send yourself SMS, or notifications to the cart.
Also, do not forget about providers do not like GSM gateways, they are easily detected and SIM is blocked, do not abuse