This object reflects the total number of Ok
(200) responses sent by the user agent since system startup.
The meaning of outbound Ok responses depends
on the method used in the associated request.
BYE : The Ok response means the call has
been terminated.
CANCEL : The Ok response means the search for
the end user has been cancelled.
INVITE : The Ok response means the called party
has agreed to participate in the call.
OPTIONS : The Ok response means the called party
has agreed to share its capabilities.
REGISTER : The Ok response means the registration
has succeeded.