Abstract
Carriers Assist Law Enforcement in Securing the Homeland
The Communications Assistance for Law Enforcement Act (CALEA) of 1994 was
passed in an effort to improve the wiretapping process and to assist local,
state, and federal law enforcement agencies (LEAs) with court-ordered lawful
electronic surveillance. What has changed over the past several years? Emerging
technology such as IP and wireless communications has brought a new level of
need for intercepting call identifying and content information. Convergence,
integration of networks, and the use of multiple networking technologies have
brought new complexities in the wiretapping process.
CALEA wiretaps can be segmented into three major functional domains
including:
- Access function
- Delivery function
- Collection function
Carriers are responsible for providing the access and delivery function of
the intercept, while LEAs are responsible for the collection function. The
access function is performed at the switch, which captures the call identifying
and content information. The delivery function is responsible for carrying the
lawful intercept to the collection point. The delivery function is based on
whether the call is delivered over IP or PSTN, and usually includes servers,
mediation devices, routers, and other equipment that collect the call
information and data. The collection function houses the LEAfs computer
system, software, and database system.
Carriers are responsible for isolating, enabling, identifying, intercepting,
and delivering all wire and electronic communications as required by lawful
authorization. The FCC regulates the carriers and their compliancy with the
CALEA "Punch List" items. The FBI originally prepared nine "Punch
list" items, yet the FCC only enforces six of them. Those include the
following:
- Dialed digit extraction- Digits dialed by a subject after initial call
setup is complete
- Party Hold/Join/Drop - Identifies parties on conference calls
- Subject Initiated Dialing and Signaling - Dialing and Signaling by
means of flash-hook and feature keys
- In-Band and Out-of-Band Signaling - Tones, network signals, and
messages
- Subject Initiated Conference Calls - Content of conference calls
- Timing Information - Call-identification correlated with content
Law enforcement agencies can perform a number of types of surveillance,
but all must be approved through a court order. The following defines the
different types of electronic surveillance:
- Pen Register – recording phone numbers of people the target is
calling
- Trap and Trace – recording phone numbers of people calling the
target
- Interception (Title III) – Includes the above two plus the recording
of the conversation of the target
There are a number of challenges that exist in accessing and delivering the
intercept whether it is a voice or data communication. The intercept of calls
for next-generation networks such as packet-based or IP and wireless telephony
are major focus for carriers today. The FCC is granting extensions for
compliancy to prolong carrier compliance, and the FBI offers a Flexible
Deployment Program to assist the carrier with CALEA compliance. Switch-based,
adjunct based, and service bureau solutions are available to carriers. There are
even some CALEA solutions meeting the intercept requirements for IP voice and
wireless data. CALEA continues to be a pressing issue for carriers, especially
with the great movement to secure the homeland. Other issues and challenges
include the privacy of conversations and the protection of customer rights.
Electronic surveillance has reached a point of urgency in the
telecommunications market mainly due to strong focus of securing the homeland
and fighting terror. This study uncovers the latest trends, technology
requirements, and technology trends. The history of CALEA, the "Punch
List" items, and other data about the U.S. wiretapping industry are
covered. CALEA is currently an issue for wireline, wireless, and cable
providers, and is now an emerging issue for other carriers such as ISPs,
broadband, and next-generation carriers.