1. A D V A N C E D C O M M U N I C A T I O N S S O L U T I O N S
C O R N E R S T O N E T E L E P H O N E C O M P A N Y , L L C

2. Advanced Communications Solutions
CornerStone, a privately held company headquartered
in New York’s Tech Valley, delivers communications
and network solutions to work environments.
With ownership of technology assets including
state-of-the-art carrier-class IP switches, multiple
data centers and cloud computing platforms, we
are uniquely positioned to deliver a full suite of
services to customers both locally and globally.
Our teams throughout New York State and
Massachusetts provide sales, technical and customer
support to businesses as no other communications
provider can. And, by leveraging our partner
relationships and core technologies, CornerStone
can serve businesses no matter where they are, with
cost-effective solutions that include:
• An integrated suite of nationally available voice,
hosted voice, data and software products
• Data center, cloud computing and hosted
applications
• Customer support and local service teams
CornerStone Telephone Company
was founded by partners Dan Yamin
and Don Walsh with an initial
investment of their own capital.
2002
Became cash flow positive
in the 1st quarter.
2003
Solutions for work environments
Corporate
Network
Remote
Office
Office
Home
Mobile

3. Our Vision
CornerStone Telephone Company will strive to
deliver comprehensive communications solutions
and innovative technologies aligned with our client’s
organizational objectives. We are determined to
enhance the customer experience through quality
products and cutting-edge, but accessible, resources.
Our Values
CornerStone’s leadership team and employees operate
according to a set of core beliefs and principles:
Integrity: We attempt to be open, honest and trust-
worthy in all of our dealings with customers, suppliers,
coworkers and our communities.
Customer Focus: We will fully satisfy our customers
with innovative technology and superior quality, value
and service.
Employees: We value our employees, encourage their
development and reward their performance.
Community: We will be responsible and valued citizens
in the communities where we live and work.
.
Reached a total of 25,000 access lines.
Opened additional sales offices.
2005
Purchased Class 5
Softswitch from
MetaSwitch.
2006
Acquired 40% of Distributed Applications
Technologies (DAT) and acquired
PBX vendor Butler Communications, as well as
Telecon Communications, a Central New York CLEC.
2006
Mission
CornerStone’s mission is to serve our clients
by providing, as a proven telecommunications
partner, reliable business communications solutions
that include telephone, Internet, hosting, data
center, and cloud computing services. We offer our
clients the best software and networks available,
all supported by unrivaled customer service and
technical support teams.
We are driven to enhance the
customer experience through
quality products and accessible,
knowledgeable resources.

4. Strategy and Customer Focus
Our business strategy is to offer competitive pricing
on a broad portfolio of products, with our customers
enjoying a positive service experience and ease of
doing business. With a churn lower than the industry
average rate of customer line loss and more than
80% of our clients remaining as repeat buyers, we
know we’re delivering on our commitment.
Leadership
CornerStone’s culture is built around the imagination
and business leadership of our founding executives
Don Walsh and Dan Yamin. During their tenures in
executive positions for large, nationwide telecom-
munications companies, they became concerned
about the practices of corporations that shaped
both product availability and their customers’
service experience around internal efficiencies
rather than customer needs. At CornerStone,
Dan and Don recruited like-minded employees
and executives, from software, information tech-
nology and telecommunications industries, that
directs daily activity with this vision. The result:
highly adaptable teams, adept at understanding
requirements and designing solutions to meet a
wide variety of needs.
Financial Strength
By consistently delivering reliable, appropriately
scaled communication solutions at good value, we’ve
enjoyed significant growth in revenue and attracted
nationwide recognition, including our status as a
multi-year honoree of INC 5000’s fastest-growing
privately held companies in the U.S. With strong
financial standing, we’ve been able to acquire the
necessary infrastructure, and in some cases the neces-
sary companies, to meet the growing communications
needs of our target markets. Executing on plan has
enabled us to transition from a small start-up to a
midsized corporation with a track record of 10 years
of consistent, profitable growth.
Began network build-out,
including Class 5 Softswitch
and IP core.
2007
Completed facilities build-out
of four local access and
transport areas (LATAs) and
18 central offices.
2008

5. Service Offerings and Technologies
Being a full-service provider requires expertise
in a full range of technologies, and partnerships
with industry leaders. We’ve known for years
that meeting the communications needs of
business customers encompasses voice, data,
and the software that they rely on in their
many-faceted operations. CornerStone’s
network build and our engagement with
partner-suppliers are founded on our desire
to bring reliable and flexible solutions to our
clients. Whether we’re filling the requirements for
Cisco certification or Microsoft Gold Certification
or leveraging platforms from industry leaders in
software encryption or from partners who
specialize in niche markets, we find applications
that our customers can consistently apply to their
daily operations.
Acquired Richmond Telephone and Richmond
Networx in Western Massachusetts, a CLEC with
$6 million in annual revenue and four central offices.
Financing was provided by Berkshire Bank.
2009
Central
Office
Colocations
Managed
Cloud
Infrastructure
and
Software
Broadband
Access and
IP Infra-
structure
Carrier
Grade
Softswitch
Data
Centers
Managed
Storage &
Dedicated
and Virtual
Servers
PLATFORMS AND
TECHNOLOGIES

6. Voice and Data Competitive Local Exchange Carrier
CornerStone deployed its Class 5 central office IP
switching platform in 2008, allowing us to offer the
many benefits of on-net services. With network
equipment colocated in nearly 30 end offices,
CornerStone can deliver a range of affordable
access options. CornerStone has agreements with
national cable providers to bring high bandwidth
Internet access over cable to customers across the
United States. Managed services and Metro Ethernet,
strategic fiber builds, and other engineered solutions
appeal to mid-sized and enterprise clients.
Data Center Hosting and Virtual Servers
CornerStone’s data centers are strategically located
at four sites throughout our serving areas. Customers
can choose between colocating their equipment for
secure, controlled environments with multiple high-
bandwidth routes or using our dedicated or virtual
data center services. With our data center assets,
CornerStone is well positioned to win greater
market share and create increased client
loyalty as business customers are
increasingly challenged to reduce
capital expenditures and
improve their overall
financial performance.
Cloud Services and Content
CornerStone’s role as a market leader in cloud
services is evident in our early entry to this market:
we have been delivering cloud computing services
since 2003. Our customers were early adapters who
enjoyed the benefits of hosted desktop services
available with Microsoft’s suite of office applications,
as well as hosted accounting, customer relationship
management, and graphics applications. With
CornerStone, you’ll enjoy working with highly
qualified industry professionals, an operation that
is SAS 70 Type II certified and Data Centers and
Exchange Platform that is SSAE 16 SOC II certified.
CornerStone leveraged our position as a content
provider by introducing a range of hosted voice
services in 2008 that included hosted IP PBX and
unified messaging services.
Acquired PINS,
a Manhattan-based CLEC and
data center services company.
2011
Fully acquired Distributed Applications
Technologies (DAT), a cloud computing company,
featuring the SkySphere® product line.
2011
Acquired ActiveHost, a data center
services company.
2011
Fiber Builds
Internet Access
Hosted IP PBX
Virtual Office
Hosted Data
Cable Access Transport
VoIP
Cloud Services
Managed Services
SIP Trunking
SERVICES

7. Launched nationally available
cable access transport (CAT) to deliver
high bandwidth and cloud voice.
2012
Our track record of success
is built on an experienced
team of leaders from diverse
industries including software,
information technology and
telecommunications. Since our
founding in 2002, CornerStone
has managed growth with
great financial responsibility.
Recent Accolades and Certifications
n The Business Review — Fastest Growing Companies
n The Business Review — Best Places to Work
n Inc. 5000
n SAS 70 Type II Audit Certified
n SSAE 16 Type II Certified
n Parallels 2012 North American Regional Partner
of the Year
A History of Results,
a Focus on the Future
CornerStone is a financially sound, expertly managed
growth company that provides outstanding services
to clients while delivering long-term gains to our
shareholders.
Since our founding in 2002, CornerStone has managed
growth with great financial responsibility. We have
reached approximately $40M in annual revenues,
outperforming many of our regional competitors, while
maintaining solid profit margins and strong earnings
before interest, taxes, and depreciation and amortiza-
tion. We’ve achieved growth organically, by our
direct and indirect sales channels, as well as through
acquisitions that allow us to add to our technology
platforms and to leverage synergies.
We are successfully entrenched as a leader in various
tier-2 and tier-3 markets throughout New York and
Massachusetts, and we have a full CLEC and data center
operation supporting a sizeable, loyal customer base in
the New York metropolitan area.
CornerStone’s team of software and voice services host-
ing professionals have helped thousands of customers
by advising them on how to best deploy these solutions.
Organizations of any size can utilize the elastic nature
of cloud voice and computing so they are able to meet
the rapidly changing demands of your customers and
continue to outpace your competitors. Our products
provide the flexibility you need to leverage the benefits
of new technology and comply with changing industry
regulations without the burden of making substantial
investments of your own organization’s time and money.

8. Voice and Data Communications
Local and long distance
Internet access
Cable access transport
Fiber
Managed and Engineered Solutions
MPLS VPN
Metro Ethernet / WANS
Engineered solutions
Cloud Services
Hosted desktops, including Microsoft®
Office Suite
Hosted applications
Web hosting
E-commerce
E-mail encryption
Hosted E-mail
E-mail Archiving
Data Center Services
Colocation
Dedicated servers
Virtual offerings
Web hosting
Data backup
System Sales
Phone systems
CornerStone Telephone Company, LLC
Headquarters
2 Third Street
Troy, New York 12180
Phone: 866 992.9111
Fax: 518 273.2750
www.cstel.com