This interface represents methods for manipulating OptionTags values for any header that contains an OptionTag value. Option tags are unique identifiers used to designate new options (extensions) in SIP. Note that these options appear as parameters in those header fields in an option-tag = token form. Option tags are defined in standards track RFCs. This is a change from past practice, and is instituted to ensure continuing multi-vendor interoperability.
@see ProxyRequireHeader
@see RequireHeader
@see UnsupportedHeader
@see SupportedHeader
@author BEA Systems, NIST
@version 1.2
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