What is the name of the usb device that can receive calls from 2g / 3g / 4g?

Question

Asterisk

I want to configure my raspberry pi and asterisk to receive calls according to the principle:
1) received a call at time1, redirect to number1;
2) received a call at time2, redirect to number2;
3) received a call at time3, but number3 is unavailable, forward the call to number1 or number2.
Is it possible to receive several calls at the same time, or is this a limitation of the mobile operator?
Due to the fact that I don’t know how to call such a device, I can’t correctly compose a search query.

Answer 1

This thing is called a GSM gateway. There are single-channel and multi-channel. An example is arttel.ru/shop/gsm-shlyuzy
You can make a budget option from several ordinary usb-3g modems that support voice transmission.

Answer 2

The device for receiving calls is called a GSM modem. Some of them have voice functions. At what part of the branded ones, the function comes off in the firmware of a particular operator, and the same for another may have a voice (for me, there is no voice in the native Beeline firmware of the modem, but there is a voice with the MTS firmware).

Answer 3

If you don’t care about the operator who owns the SIM card for receiving calls and you have Internet access on your raspberry, use the multiphone service from the megaphone. As a result, out of the box without physical devices such as modems and gateways (which cost money, and good gateways are GOOD money), you will have a MULTI-CHANNEL number without a monthly fee not physically tied to a SIM card .. And the rest of your Wishlist will be made to you by an asterisk with a few lines in the dialplan.
I use a multiphone in a similar scheme for a long time and productively. For other operators I use EXPENSIVE GSM gateways Addpac-1002 and 1004...