EXHIBIT 99.1


News Release - November 19, 2004

IASG COMPLETES PURCHASE OF NATIONAL ALARM COMPUTER CENTER ASSETS AND ANNOUNCES
CONFERENCE CALL

ALBANY, N.Y.--(BUSINESS WIRE)--Nov. 19, 2004--Integrated Alarm Services Group,
Inc. (NASDAQ: IASG) a total solution provider to independent security alarm
dealers located throughout the United States today announced the completion of
the purchase of substantially all of the assets of National Alarm Computer
Center, Inc. (NACC), a unit of Tyco International Ltd's Fire and Security
Segment (NYSE:TYC). The purchase price for the NACC assets was $50.3 million
cash.

The NACC assets to be acquired include a state-of-the-art electronic security
alarm monitoring center located in Irvine, California. NACC currently generates
approximately $800,000 in third party alarm monitoring recurring monthly
revenues (RMR) and owns a portfolio of alarm contracts, which generates
approximately $430,000 in RMR. The majority of the third-party accounts that
NACC monitors and the owned contracts are located in California. IASG is also
acquiring a portfolio of secured loans to alarm dealers totaling approximately
$29 million as part of the NACC transaction.

In announcing the acquisition, Timothy M. McGinn, Chairman and CEO of IASG said,
"This is not just a compelling acquisition financially, it is also strategically
important for IASG. It furthers our number one position in third party wholesale
monitoring, it increases our owned account penetration in the western United
States, and finally, it brings to us a first rate central station facility. The
added scale from the NACC acquisition will afford IASG meaningful synergies and
expense savings opportunities in managing our monitoring activities
Company-wide. We expect to realize on-going savings of approximately $2.5
million (on an annualized basis) from such synergies over the course of the next
three quarters.

As a result of this transaction, the number of subscribers monitored by IASG
increases to approximately 760,000 and generates approximately $2.9 million of
third-party RMR. IASG's owned portfolio increases to approximately 160,000 of
contract equivalents generating approximately $4.8 million of RMR. Additionally,
the Company's dealer loan portfolio expands from $4.5 million at September 30,
2004 to approximately $33.5 million. A management conference call and
simultaneous webcast to discuss the Company's recently announced third quarter
results, $155 million of long-term debt financing and the NACC transaction will
be held at 12:00 p.m. EST on Tuesday, November 23, 2004. A digital audio replay
will be available in the investor relations section of the Company's website at
www.iasg.us.

ABOUT IASG
Integrated Alarm Services Group provides total integrated solutions to
independent security alarm dealers located throughout the United States to
assist them in serving the residential and commercial security alarm market.
IASG's services include alarm contract financing including the purchase of
dealer alarm contracts for its own portfolio and providing loans to dealers
collateralized by alarm contracts. IASG, with 5,000 independent dealer
relationships, is also the largest wholesale provider of alarm contract
monitoring and servicing. For more information about IASG please visit our web
site at http://www.iasg.us.

ABOUT TYCO INTERNATIONAL

Tyco International Ltd. is a global, diversified company that provides vital
products and services to customers in five business segments: Fire & security,
Electronics, Healthcare, Engineered Products and Services, and Plastics and
Adhesives. With 2003 revenue of $37 billion, Tyco employs 260,000 people
worldwide. More information on Tyco can be found at www.tyco.com.


This press release may contain statements, which are not historical facts and
are considered forward-looking statements within the meaning of the Private
Securities Litigation Reform Act of 1995. These forward-looking statements
contain projections of IASG's future results of operations, financial position
or state other forward-looking information. In some cases you can identify these
statements by forward looking words such as "anticipate", "believe", "could",
"estimate", "expect", "intend", "may", "should", "will", and "would" or similar
words. You should not rely on forward-looking statements because IASG's actual
results may differ materially from those indicated by these forward looking
statements as a result of a number of important factors. These factors include,
but are not limited to: general economic and business conditions; our business
strategy for expanding our presence in our industry; anticipated trends in our
financial condition and results of operation; the impact of competition and
technology change; existing and future regulations effecting our business, and
other risks and uncertainties discussed under the heading "Risks Related to our
Business" in IASG's Form 10-K report for the period ending December 31, 2003 as
filed with the Securities and Exchange Commission on March 30, 2004, and other
reports IASG files from time to time with the Securities and Exchange
Commission. IASG does not intend to and undertakes no duty to update the
information contained in this press release.

CONTACT:
Integrated Alarm Services Group, Inc.
Investor Relations:
Joseph L. Reinhart, 518-426-1515