/// <summary>
        /// Map a StandardMethodType to StandardMethod that can
        /// then be used as an index into our requests array
        /// </summary>
        /// <param name="sm"></param>
        /// <returns></returns>
        protected int MapStandardMethodTypeToIndex(Request.StandardMethodType sm)
        {
            switch (sm)
            {
            case Request.StandardMethodType.Invite:
                return((int)StandardMethod.Invite);

            case Request.StandardMethodType.Bye:
                return((int)StandardMethod.Bye);

            case Request.StandardMethodType.Info:
                return((int)StandardMethod.Info);

            case Request.StandardMethodType.Register:
                return((int)StandardMethod.Register);

            case Request.StandardMethodType.Notify:
                return((int)StandardMethod.Notify);

            case Request.StandardMethodType.Message:
                return((int)StandardMethod.Message);

            default:
                return((int)StandardMethod.Other);
            }
        }
 /// <summary>
 /// increments number of requests received
 /// for the particular method type
 /// </summary>
 /// <param name="sm">the sip method</param>
 public void Update(Request.StandardMethodType sm)
 {
     Interlocked.Increment(ref requests[MapStandardMethodTypeToIndex(sm)]);
 }