Is it possible to make the following device using raspberry or arduino?

Question

Arduino

Connoisseurs, please tell me whether it is possible to make the following device using the devices indicated in the title.
It is necessary to make a device into which you can insert 2 sim cards (Sim1 and Sim2). Now, if subscriber 1 calls Sim1, but the device cancels the incoming call, takes the phone number and calls subscriber 1 and subscriber 2 from Sim 2. Is it possible to connect 2 gsm modules to the above devices at once? If anyone has experience, please advise what is better to buy?

Answer 1

A cursory googling says that the GSM modules are controlled by AT commands that are sent over the serial port. 2 modules - 2 serial ports, such wealth seems to be even on arduins ...

Answer 2

From the description it looks like a callback device. Apparently, the dispatcher or something like that is sitting on the subscriber 2. Subscriber 1 is the same customer who doesn't have to spend their money. Then the use of iron will not be advisable here. You can solve it in 2 ways, correct and as usual. The correct one is renting 8800 numbers, it will cost from 1.5k rubles per month + a minute about 1 ruble. average. As usual, you can write a simple software that will run on any cheap android smartphone and implement all the functionality that is required in the task programmatically. In this case, there are pluses, for example, the incoming number and application will be 1, but there can be an unlimited number of operators. It is implemented in the simplest case by a client-server architecture. Server - incoming number, clients - operators.

Answer 3

raspberry + 2GSM modem + asterisk (there are ready-made assemblies for raspberries) + setting up the callback function = you can do it.

Answer 4

If there is no mandatory binding specifically to GSM, then it is much easier to make a Voip PBX even on the same aster. Instead of SIM cards, you just buy numbers from the provider.