/// <summary> /// Default constructor. /// </summary> /// <param name="method">SIP request method.</param> /// <exception cref="ArgumentNullException">Is raised when <b>method</b> is null reference.</exception> public SIP_Request(string method) { if (method == null) { throw new ArgumentNullException("method"); } m_pRequestLine = new SIP_RequestLine(method, new AbsoluteUri()); }