/// SIP Option Tags. Defined in RFC 3261 27.1, defined values are in: http://www.iana.org/assignments/sip-parameters.
/// 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).
public class SIP_OptionTags
/// 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.
public const string x100rel = "100rel";
/// A UA adding the early-session option tag to a message indicates that it understands the
/// early-session content disposition. Defined in rfc 3959.
public const string early_session = "early-session";
/// Extension to allow subscriptions to lists of resources. Defined in rfc 4662.
public const string eventlist = "eventlist";
/// 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.
public const string histinfo = "histinfo";
/// Support for the SIP Join Header. Defined in rfc 3911.
public const string join = "join";
/// 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.
public const string norefersub = "norefersub";
/// 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.
public const string path = "path";
/// 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.
public const string precondition = "precondition";
/// This option tag is used to ensure that a server understands the callee capabilities
/// parameters used in the request. Defined in rfc 3840.
public const string pref = "pref";
/// 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.
public const string privacy = "privacy";
/// This option tag indicates support for the SIP Replaces header. Defined in rfc 3891.
public const string replaces = "replaces";
/// Indicates or requests support for the resource priority mechanism. Defined in rfc 4412.
public const string resource_priority = "resource-priority";
/// 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.
public const string sdp_anat = "sdp-anat";
/// 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.
public const string sec_agree = "sec-agree";
/// 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.
public const string tdialog = "tdialog";
/// 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.
public const string timer = "timer";
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