pen : Pen Register - provides trace of all outgoing
calls. Only Call Data is sent.
trace : Trace - provides trace of all incoming calls.
Only Call Data is sent.
penAndTrace : Provides trace of both incoming and outgoing
calls. Only Call Data is sent.
intercept : Provides both Call Data and Call Content to
Commission on Accreditation for Law
Enforcement Agencies (CALEA). Intercept
is applicable to both originating and
terminating calls.