Hi, I am starting my business from another country in the United States and to seek help, i have to explain the whole situation. So the thing is, we are gonna remotely connect with the screens of restaurants located in US. Customer is gonna call to place an order either for pickup/delivery. I need to know how can i configure phones from that restaurant to my country so that when somebody calls on that restaurant i would be recieving that call here.
There is a ton of ways to route the calls, one being the grandstream you mention. But a call from the US to Pakistan over standard internet would be nasty in quality. The Jitter and Latency would cause excessive echos, pops, or other issues with the calls. The owner of the number would be required to send the calls to your solution, and then the store / your staff would all need to be registered to that solution.