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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>
    /// SIP Option Tags. Defined in RFC 3261 27.1, defined values are in: http://www.iana.org/assignments/sip-parameters.
    /// </summary>
    /// <remarks>
    /// Option tags are used in header fields such as Require, Supported, Proxy-Require, and 
    /// Unsupported in support of SIP compatibility mechanisms for extensions (Section 19.2). 
    /// The option tag itself is a string that is associated with a particular SIP option (that is, an extension).
    /// </remarks>
    public class SIP_OptionTags
    {
        /// <summary>
        /// This option tag is for reliability of provisional responses. When present in a 
        /// Supported header, it indicates that the UA can send or receive reliable provisional
        /// responses. When present in a Require header in a request it indicates that the UAS MUST 
        /// send all provisional responses reliably. When present in a Require header in a
        /// reliable provisional response, it indicates that the response is to be sent reliably.
        /// Defined in rfc 3262.
        /// </summary>
        public const string x100rel = "100rel";

        /// <summary>
        /// A UA adding the early-session option tag to a message indicates that it understands the 
        /// early-session content disposition. Defined in rfc 3959.
        /// </summary>
        public const string early_session = "early-session";

        /// <summary>
        /// Extension to allow subscriptions to lists of resources. Defined in rfc 4662.
        /// </summary>
        public const string eventlist = "eventlist";

        /// <summary>
        /// When used with the Supported header, this option tag indicates support for the 
        /// History Information to be captured for requests and returned in subsequent responses. 
        /// This tag is not used in a Proxy-Require or Require header field since support of 
        /// History-Info is optional. Defined in rfc 4244.
        /// </summary>
        public const string histinfo = "histinfo";

        /// <summary>
        /// Support for the SIP Join Header. Defined in rfc 3911.
        /// </summary>
        public const string join = "join";

        /// <summary>
        /// This option tag specifies a User Agent ability of accepting a REFER request without 
        /// establishing an implicit subscription (compared to the default case defined in RFC3515).
        /// Defined in rfc 3911.
        /// </summary>
        public const string norefersub = "norefersub";

        /// <summary>
        /// A SIP UA that supports the Path extension header field includes this option tag as a 
        /// header field value in a Supported header field in all requests generated by that UA. 
        /// Intermediate proxies may use the presence of this option tag in a REGISTER request to
        /// determine whether to offer Path service for for that request. If an intermediate proxy 
        /// requires that the registrar support Path for a request, then it includes this option tag 
        /// as a header field value in a Requires header field in that request. Defined in rfc 3327.
        /// </summary>
        public const string path = "path";

        /// <summary>
        /// An offerer MUST include this tag in  the Require header field if the offer contains 
        /// one or more "mandatory" strength-tags. If all the strength-tags in the description are
        /// "optional" or "none" the offerer MUST include this tag either in a Supported header field or 
        /// in a Require header field. Defined in rfc 3312.
        /// </summary>
        public const string precondition = "precondition";

        /// <summary>
        /// This option tag is used to ensure that a server understands the callee capabilities 
        /// parameters used in the request. Defined in rfc 3840.
        /// </summary>
        public const string pref = "pref";

        /// <summary>
        /// This option tag indicates support for the Privacy mechanism. When used in the 
        /// Proxy-Require header, it indicates that proxy servers do not forward the request unless they 
        /// can provide the requested privacy service. This tag is not used in the Require or 
        /// Supported headers. Proxies remove this option tag before forwarding the request if the desired 
        /// privacy function has been performed. Defined in rfc 3323.
        /// </summary>
        public const string privacy = "privacy";

        /// <summary>
        /// This option tag indicates support for the SIP Replaces header. Defined in rfc 3891.
        /// </summary>
        public const string replaces = "replaces";

        /// <summary>
        /// Indicates or requests support for the resource priority mechanism. Defined in rfc 4412.
        /// </summary>
        public const string resource_priority = "resource-priority";

        /// <summary>
        /// The option-tag sdp-anat is defined for use in the Require and Supported SIP [RFC3261] 
        /// header fields. SIP user agents that place this option-tag in a Supported header field understand 
        /// the ANAT semantics as defined in [RFC4091]. Defined in rfc 4092.
        /// </summary>
        public const string sdp_anat = "sdp-anat";

        /// <summary>
        /// This option tag indicates support for the Security Agreement mechanism. When used in the 
        /// Require, or Proxy-Require headers, it indicates that proxy servers are required to use the Security 
        /// Agreement mechanism.  When used in the Supported header, it indicates that the User Agent Client 
        /// supports the Security Agreement mechanism. When used in the Require header in the 494 (Security Agreement 
        /// Required) or 421 (Extension Required) responses, it indicates that the User Agent Client must use the 
        /// Security Agreement Mechanism. Defined in rfc 3329.
        /// </summary>
        public const string sec_agree = "sec-agree";

        /// <summary>
        /// This option tag is used to identify the target dialog header field extension.  When used in a 
        /// Require header field, it implies that the recipient needs to support the Target-Dialog header field. 
        /// When used in a Supported header field, it implies that the sender of the message supports it. 
        /// Defined in rfc 4538.
        /// </summary>
        public const string tdialog = "tdialog";

        /// <summary>
        /// This option tag is for support of the session timer extension. Inclusion in a Supported 
        /// header field in a request or response indicates that the UA is capable of performing 
        /// refreshes according to that specification.  Inclusion in a Require header in a request 
        /// means that the UAS must understand the session timer extension to process the request.  
        /// Inclusion in a Require header field in a response indicates that the UAC must look for the 
        /// Session-Expires header field in the response, and process accordingly. Defined in rfc 4028.
        /// </summary>
        public const string timer = "timer";
    }
}

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About the Author

Ivar Lumi

Estonia Estonia
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