Home | Site Map

AT&T is among the strongest performers of enterprise-class Voice Over Internet Protocol (VOIP) service providers.

Voice over IP

AT&T® is the only provider that supports all three of the major IP PBX vendors today: Avaya, Cisco and Nortel.

This multi-vendor support is a critical consideration for enterprises that want to realize the many advantages of VoIP while protecting the investement that they already made in voice calling systems.




Request A Quote

As an AT&T® Solutions Provider Champion, CSI offers a full range of AT&T® products and services. Just fill out the request a quote form for AT&T® products and services.


AT&T® and VoIP

AT&T® Voice over IP (VoIP) converges your voice and data communications on one network-helping you take advantage of more effective ways to satisfy your customers.

Learn more about
AT&T® and VoIP.

AT&T® Managed
Router with VoIP

AT&T® will take care of the design, implementation and management of your IP-based voice/data solution. Deploy the latest messaging applications, interactive Call Centers and web-enabled VoIP with AT&T®.

Learn more about AT&T®
Managed Router with VoIP.

VoIP Virtual
Telephone Numbers

Virtual Telephone Numbers separate the phone number from its geographic location. VoIp allows you to have telephone numbers in a desired area code regardless of where the phone is physically located.

Learn more about VoIP
virtual telephone numbers.

AT&T® VoIP FlexReach

AT&T® IP Flexible Reach is a managed Voice over IP communication solution that supports inbound and outbound calling on your data network giving you local, U.S. long distance and international reach for your U.S. sites.

Learn more about
AT&T® VoIP FlexReach.

Critical Steps to VoIP

Deploying a real-time application like VoIP across a network designed for data presents unique challenges for network managers.

Learn about the critical steps for a successful VoIP Deployment. [PDF]


AT&T® Voice DNA service is a network-based communications solution that utilizes AT&T®’s industry leading global Internet Protocol (IP) network to deliver enhanced communication and collaboration tools.

Learn more about VoIP DNA. [PDF]

VoIP and Security

As businesses converge their voice and data networks to support
their business applications, new security challenges are introduced.
Integration of automated business functions and real-time collaboration
– while great for productivity – increase risk and exposure.

Learn more about
VoIP and security.