Click here to Skip to main content
15,867,704 members
Articles / Programming Languages / C#

SIP Stack with SIP Proxy - (VOIP)

Rate me:
Please Sign up or sign in to vote.
4.86/5 (45 votes)
11 Jun 2007CPOL2 min read 1.6M   28.1K   162  
C# implementation of SIP
using System;
using System.Collections.Generic;
using System.Text;

namespace LumiSoft.Net.SIP.Message
{
    /// <summary>
    /// Implements SIP "RAck" value. Defined in RFC 3262.
    /// </summary>
    /// <remarks>
    /// <code>
    /// RFC 3262 Syntax:
    ///     RAck         = response-num LWS CSeq-num LWS Method
    ///     response-num = 1*DIGIT
    ///     CSeq-num     = 1*DIGIT
    /// </code>
    /// </remarks>
    public class SIP_t_RAck : SIP_t_Value
    {
        private int    m_ResponseNumber = 1;
        private int    m_CSeqNumber     = 1;
        private string m_Method         = "";

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="value">RAck value.</param>
        public SIP_t_RAck(string value)
        {
            Parse(value);
        }

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="responseNo">Response number.</param>
        /// <param name="cseqNo">CSeq number.</param>
        /// <param name="method">Request method.</param>
        public SIP_t_RAck(int responseNo,int cseqNo,string method)
        {
            this.ResponseNumber = responseNo;
            this.CSeqNumber     = cseqNo;
            this.Method         = method;
        }


        #region method Parse

        /// <summary>
        /// Parses "RAck" from specified value.
        /// </summary>
        /// <param name="value">SIP "RAck" value.</param>
        /// <exception cref="ArgumentNullException">Raised when <b>value</b> is null.</exception>
        /// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
        public void Parse(string value)
        {
            if(value == null){
                throw new ArgumentNullException("value");
            }

            Parse(new StringReader(value));
        }

        /// <summary>
        /// Parses "RAck" from specified reader.
        /// </summary>
        /// <param name="reader">Reader from where to parse.</param>
        /// <exception cref="ArgumentNullException">Raised when <b>reader</b> is null.</exception>
        /// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
        public override void Parse(StringReader reader)
        {
            /*
                RAck         = response-num LWS CSeq-num LWS Method
                response-num = 1*DIGIT
                CSeq-num     = 1*DIGIT
            */

            if(reader == null){
                throw new ArgumentNullException("reader");
            }

            // response-num
            string word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("RAck response-num value is missing !");
            }
            try{
                m_ResponseNumber = Convert.ToInt32(word);
            }
            catch{
                throw new SIP_ParseException("Invalid RAck response-num value !");
            }

            // CSeq-num
            word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("RAck CSeq-num value is missing !");
            }
            try{
                m_CSeqNumber = Convert.ToInt32(word);
            }            
            catch{
                throw new SIP_ParseException("Invalid RAck CSeq-num value !");
            }

            // Get request method
            word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("RAck Method value is missing !");
            }
            m_Method = word;
        }

        #endregion

        #region method ToStringValue

        /// <summary>
        /// Converts this to valid "RAck" value.
        /// </summary>
        /// <returns>Returns "RAck" value.</returns>
        public override string ToStringValue()
        {
            /*
                RAck         = response-num LWS CSeq-num LWS Method
                response-num = 1*DIGIT
                CSeq-num     = 1*DIGIT
            */

            return m_ResponseNumber + " " + m_CSeqNumber + " " + m_Method;
        }

        #endregion


        #region Properties Implementation

        /// <summary>
        /// Gets or sets response number.
        /// </summary>
        public int ResponseNumber
        {
            get{ return m_ResponseNumber; }

            set{
                if(value < 1){
                    throw new ArgumentException("ResponseNumber value must be >= 1 !");
                }

                m_ResponseNumber = value;
            }
        }

        /// <summary>
        /// Gets or sets CSeq number.
        /// </summary>
        public int CSeqNumber
        {
            get{ return m_CSeqNumber; }

            set{
                if(value < 1){
                    throw new ArgumentException("CSeqNumber value must be >= 1 !");
                }

                m_CSeqNumber = value;
            }
        }

        /// <summary>
        /// Gets or sets method.
        /// </summary>
        public string Method
        {
            get{ return m_Method; }

            set{
                if(value == null){
                    throw new ArgumentNullException("Method");
                }

                m_Method = value;
            }
        }

        #endregion

    }
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Estonia Estonia
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

Comments and Discussions