"100": "Trying"
"180": "Ringing"
"181": "Call Is Being Forwarded"
"182": "Queued"
"183": "Session Progress"
"199": "Early Dialog Terminated"
"200": "Success"
"202": "Accepted"
"204": "No Notification"
"300": "Multiple Choices"
"301": "Moved Permanently"
"302": "Moved Temporarily"
"305": "Use Proxy"
"380": "Alternative Service"
"400": "Bad Request"
"401": "Unauthorized"
"402": "Payment Required"
"403": "Forbidden"
"404": "Not Found"
"405": "Method Not Allowed"
"406": "Not Acceptable"
"407": "Proxy Authentication Required"
"408": "Request Timeout"
"409": "Conflict"
"410": "Gone"
"411": "Length Required"
"412": "Conditional Request Failed"
"413": "Request Entity Too Large"
"414": "Request URI Too Long"
"415": "Unsupported Media Type"
"416": "Unsupported URI Scheme"
"417": "Unknown Resource-priority"
"420": "Bad Extension"
"421": "Extension Required"
"422": "Session Interval Too Small"
"423": "Interval Too Brief"
"424": "Bad Location Information"
"428": "Use Identity Header"
"429": "Provide Referrer Identity"
"430": "Flow Failed"
"433": "Anonymity Disallowed"
"436": "Bad Identity Info"
"437": "Unsupported Certificate"
"438": "Invalid Identity Header"
"439": "First Hop Lacks Outbound Support"
"440": "Max-breadth Exceeded"
"469": "Bad Info Package"
"470": "Consent Needed"
"480": "Temporarily Unavailable"
"481": "Call/transaction Does Not Exist"
"482": "Loop Detected"
"483": "Too Many Hops"
"484": "Address Incomplete"
"485": "Ambiguous"
"486": "Busy Here"
"487": "Request Terminated"
"488": "Not Acceptable Here"
"489": "Bad Event"
"491": "Request Pending"
"493": "Undecipherable"
"494": "Security Agreement Required"
"500": "Internal Server Error"
"501": "Not Implemented"
"502": "Bad Gateway"
"503": "Service Unavailable"
"504": "Server Time-out"
"505": "Version Not Supported"
"513": "Message Too Large"
"555": "Push Notification Service Not Supported"
"580": "Precondition Failure"
"600": "Busy Everywhere"
"603": "Decline"
"604": "Does Not Exist Anywhere"
"606": "Not Acceptable"
"607": "Unwanted"
"608": "Rejected"