Simply put, point-to-point SMS means that one mobile phone sends SMS before another, and the SMS sent to the information desk is not a point-to-point SMS. Among them, there are point-to-point in the network (mobile to mobile) and point-to-point outside the network (mobile to Unicom or PHS)
Solution to your problem: Call your local China mobile phone 10086 and ask your local SMS gateway, then record it and set it as the gateway address in SMS settings.