anchor.diff:  
     Response.fromPacketBody(String this.rawBody);
   
  +  /**
  +   * The status of the response. Can be either [OK], [ERROR] or [UNKNOWN].
  +   */
     String get status {
       String lastLine = this.rawBody.split('\n').last;
   
  
positive.code:     }
    }
  
    String get channelUUID {
      String lastLine = this.rawBody.split('\n').last;
  
      if (lastLine.startsWith(OK)) {
        return lastLine.substring(OK.length, lastLine.length).trim();
      } else {
        throw new StateError('Response does not carry channel information. Raw body: ${this.rawBody}');
      }
    }
  
    @override
    String toString() {
      return this.rawBody;
  
negative.code: part of esl;
  
  /**
   * Class representing a reponse received from the FreeSWTICH event socket.
   */
  class Response {
  
    static const String OK      = '+OK';
    static const String ERROR   = '-ERR';
  