BroadWorks Functional Summary - CommPartners Connect

2.13 Lawful Intercept Punch-List Items
Feature ID(s): 12975, 12976
This feature addresses the following Communication Assistance for the Law Enforcement
Act (CALEA) items:
� Subject-initiated signaling — the SubjectSignal message is introduced and sent to the
lawful enforcement agency (LEA) or mediation device’s (MD) collection function.
� Dialed-digit extraction — the DialedDigitExtraction message is introduced and sent to
the LEA or MD’s collection function if digits are dialed by the subject under
surveillance once a call is connected.
2.13.1 Description
This feature enhances the Lawful Intercept administrative function and implements the
SubjectSignal and DialedDigitExtraction CDC messages required to address some of the
CALEA punch list items.
2.13.1.1 Lawful Intercept Administration
The administrative function of Lawful Intercept is modified to allow a toggle for the new
functionality on a per surveillance basis.
2.13.1.2 SubjectSignal
The SubjectSignal CDC message captures any signal that is initiated by the intercept
subject. In the context of BroadWorks, the following signal is detected and reported:
Flash – The user flashes 1) to put a call on hold and originate a second call, 2) to answer
a second incoming call and toggle between two calls, 3) to transfer a consultation call or 4)
to conference two calls together. When a surveillance subject flashes, the appropriate
SubjectSignal is sent to the LEA.
2.13.1.3 DialedDigitExtraction
The DialedDigitExtraction CDC message captures the digits dialed by the subject under
surveillance once the call is connected. Extracted digits are reported individually in
separate DialedDigitExtraction messages.
For a typical call under surveillance where media monitoring is enabled, a pair of repeaters
is set up on the Media Server and the media stream between the subject under
surveillance and the other party is hair-pinned back to the Media Server repeaters. Each
repeater works in a particular direction and repeats the received media to the other party.
The Media Server also repeats the intercepted media streams to the LEA. If Dialed Digit
Extraction is enabled for that surveillance, the media stream in the transmit direction is
also repeated to a Media Server IVR that reports all the dialed digits to the Application
Server.
Note that although the Dialed Digit Extraction capability relies on the setup of repeaters in
the media path between the subject and the other party, media monitoring does not need
to be enabled for dialed digit extraction to be active on a call. If media monitoring is
disabled and Dialed Digit Extraction is enabled, then the media stream between the
subject under surveillance and the other party is hair-pinned back to the Media Server
repeaters, but the intercepted media is not transmitted to the LEA.
BROADWORKS FUNCTIONAL SUMMARY 2O-BD5013-00
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