SIP
433 Anonymity Disallowed
The request has been rejected because the server policy requires caller identification and the request was anonymous.
เมื่อคุณพบรหัสนี้
When calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
วิธีแก้ไข
Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.