Regarding SIP registration, the following description is incorrect?

Registration information must be refreshed periodically, and typically Register saves registration information to Location Server.

Users need to register with the server each time they power on the system.

Re-registration is required when the address of SIP C1ient changes.

The purpose of SIP registration is to bind the AOR address to a Contact address so that the Proxy can find the address of the caller when calling.