am ca3c24db: Merge "SIP: add SipErrorCode for error feedback." into gingerbread

Merge commit 'ca3c24db3ae4b7a513f1ca76b1e7a3f56a020680' into gingerbread-plus-aosp

* commit 'ca3c24db3ae4b7a513f1ca76b1e7a3f56a020680':
  SIP: add SipErrorCode for error feedback.