How to establish a Call-center through GSM-gateways?

Question

CRM

Guys, tell me ..
There is a small call center ... All operators work remotely through cloud CRM and IP telephony ..
but the problem is that it is expensive .. 2 r / min .. and if 5-10 operators work, then the sums are impressive per month..
Accordingly, there were questions about optimizing
costs
.
1. Is it possible to set up the scheme "Remote operators + server + CRM + GSM-gateway"?
2. If yes, what is the best equipment to buy?
3. Is it possible to make one outgoing number for sims?
4. Is it possible to assemble CRM from ready-made solutions? Or write from scratch? (dialing through a flooded database + receiving incoming calls + a card for each number (name, address, notes, etc.) + call status + API integration with Russian mail (upload parcel statuses to customer cards), etc.))

Answer 1

It really depends on the cost. I'm afraid that with 5-10 operators it's not cost-effective. Those. gsm gateways are not expensive, but apparently you have everything "cloudy" including the office. This means that you will need hardware, accommodation, software and personnel who will serve all this.
One number per SIM card is impossible, each SIM card has its own number, there are problems with callbacks (the SIM card does not have much linearity), many do not trust calls from left numbers.