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SIP Stack with SIP Proxy - (VOIP)

, 11 Jun 2007
C# implementation of SIP
SIP_Proxy_demo.zip
SIP_Proxy_demo
SIP_Proxy_demo.suo
SIP_Proxy_demo
bin
Debug
LumiSoft.Net.dll
SIP_Proxy_demo.exe
SIP_Proxy_demo.vshost.exe
dep
LumiSoft.Net.dll
LumiSoft.Net.pdb
Properties
Settings.settings
Resources
add.ico
app.ico
delete.ico
edit.ico
error.ico
info.ico
refresh.ico
rule.ico
server_running.ico
server_stopped.ico
viewmessages.ico
Stack.zip
Net
docs
dns
dns_records.jpg
dns_records.vsd
Net
_junk
_Obsolete
AUTH
bin
Release
LumiSoft.Net.dll
Data
Dns
Client
FTP
Client
Server
HTTP
Server
ICMP
IMAP
Client
Server
IO
Log
LumiSoft.Net
Mime
vCard
Net.csproj.user
Net.suo
NNTP
Client
POP3
Client
Server
RTP
SDP
ServersCore
SIP
Client
Message
Proxy
Stack
SMTP
Client
Server
STUN
Client
Message
URI
using System;
using System.Collections.Generic;
using System.Text;

namespace LumiSoft.Net.SIP.Message
{
    /// <summary>
    /// Implements SIP "reason-value" value. Defined in rfc 3326.
    /// </summary>
    /// <remarks>
    /// <code>
    /// RFC 3326 Syntax:
    ///     reason-value      =  protocol *(SEMI reason-params)
    ///     protocol          =  "SIP" / "Q.850" / token
    ///     reason-params     =  protocol-cause / reason-text / reason-extension
    ///     protocol-cause    =  "cause" EQUAL cause
    ///     cause             =  1*DIGIT
    ///     reason-text       =  "text" EQUAL quoted-string
    ///     reason-extension  =  generic-param
    /// </code>
    /// </remarks>
    public class SIP_t_ReasonValue : SIP_t_ValueWithParams
    {
        private string m_Protocol = "";

        /// <summary>
        /// Default constructor.
        /// </summary>
        public SIP_t_ReasonValue()
        {
        }

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="value">SIP reason-value value.</param>
        public SIP_t_ReasonValue(string value)
        {
            Parse(value);
        }


        #region method Parse
        
        /// <summary>
        /// Parses "reason-value" from specified value.
        /// </summary>
        /// <param name="value">SIP "reason-value" 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 "reason-value" 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)
        {
            /*
                reason-value      =  protocol *(SEMI reason-params)
                protocol          =  "SIP" / "Q.850" / token
                reason-params     =  protocol-cause / reason-text / reason-extension
                protocol-cause    =  "cause" EQUAL cause
                cause             =  1*DIGIT
                reason-text       =  "text" EQUAL quoted-string
                reason-extension  =  generic-param
            */

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

            // protocol
            string word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("SIP reason-value 'protocol' value is missing !");
            }
            m_Protocol = word;

            // Parse parameters
            ParseParameters(reader);
        }

        #endregion

        #region method ToStringValue

        /// <summary>
        /// Converts this to valid "reason-value" value.
        /// </summary>
        /// <returns>Returns "reason-value" value.</returns>
        public override string ToStringValue()
        {
            /*
                reason-value      =  protocol *(SEMI reason-params)
                protocol          =  "SIP" / "Q.850" / token
                reason-params     =  protocol-cause / reason-text / reason-extension
                protocol-cause    =  "cause" EQUAL cause
                cause             =  1*DIGIT
                reason-text       =  "text" EQUAL quoted-string
                reason-extension  =  generic-param
            */

            StringBuilder retVal = new StringBuilder();
            
            // Add protocol
            retVal.Append(m_Protocol);

            // Add parameters
            retVal.Append(ParametersToString());

            return retVal.ToString();
        }

        #endregion


        #region Properties Implementation

        /// <summary>
        /// Gets or sets protocol.
        /// </summary>
        /// <exception cref="ArgumentNullException">Is raised when null value is passed.</exception>
        public string Protocol
        {
            get{ return m_Protocol; }

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

                m_Protocol = value;
            }
        }

        /// <summary>
        /// Gets or sets 'cause' parameter value. The cause parameter contains a SIP status code. 
        /// Value -1 means not specified.
        /// </summary>
        public int Cause
        {
            get{
                if(this.Parameters["cause"] == null){
                    return -1;
                }
                else{
                    return Convert.ToInt32(this.Parameters["cause"].Value); 
                }
            }

            set{
                if(value < 0){
                    this.Parameters.Remove("cause");
                }
                else{
                    this.Parameters.Set("cause",value.ToString());
                }
            }
        }

        /// <summary>
        /// Gets or sets 'text' parameter value. Value null means not specified.
        /// </summary>
        public string Text
        {
            get{
                SIP_Parameter parameter = this.Parameters["text"];
                if(parameter != null){
                    return parameter.Value;
                }
                else{
                    return null;
                }
            }

            set{
                if(value == null){
                    this.Parameters.Remove("text");
                }
                else{
                    this.Parameters.Set("text",value);
                }
            }
        }

        #endregion

    }
}

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

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About the Author

Ivar Lumi

Estonia Estonia
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