Merge commit '5f93c39cdb2f75dda805691987ccd4e570f6cb74' * commit '5f93c39cdb2f75dda805691987ccd4e570f6cb74': SIP: add SipErrorCode for error feedback.
Merge commit '5f93c39cdb2f75dda805691987ccd4e570f6cb74' * commit '5f93c39cdb2f75dda805691987ccd4e570f6cb74': SIP: add SipErrorCode for error feedback.