ESI digital and VoIP phone systems are the most reliable and trusted name in business phone systems. Whether you are looking for a new system or need help with an existing system, Cargill Telecommunications can help. Our expert staff handles complete installations, upgrades, programming changes and maintenance. Have a question or just need to talk to someone who can give you an answer? Call us; we’re experts when it comes to ESI.

Cargill Telecommunications has you covered when it comes to ESI’s wide array of phone systems including: Legacy IVX or the newest Communications Servers and Cloud based systems. If you need two phones or 800, we have the solution for your business.

ESI makes digital and VoIP phone systems designed to make productivity and efficiency soar in your office. Covering every type of phone system technology  from the most basic to the most advanced, ESI has the solutions you need to do business.

Regardless of which model you select (they vary primarily by call-handling and voice message storage capacity), an ESI Communications Server will serve your needs now and for years to come. This fully flexible communications platform can support both digital telephony and IP-to-the-desktop in any desired combination. ESI Communications Servers also deliver massive expand ability and the greatest functionality ESI has ever offered.

Call to find out more about how our ESI digital and VoIP phone systems can meet your needs or go directly to our page.


ComServer family of phone systems

ESI CS-1000

The largest model, the ESI-1000, supports a maximum system capacity of 1,128 communications ports. An ESI Communications Server’s backplane, switching matrix, and main board are designed to allow for a traditional digital installation or a VoIP configuration in varying capacities. The non-blocking architecture increases station capacity to a full complement of up to 816 telephones. All ESI phone models, both IP-based and digital, provide advanced ESI features. The supported models are:
• ESI 60IP Business Phone and ESI 60D (digital) Business Phone — The ESI 60IP is available in both Gigabit Ethernet and 10/100 models. Each ESI 60 Business Phone model includes 48 programmable feature keys, visual voice mail, an adjustable backlit display, and a full-duplex, high-definition speakerphone.
• ESI 55IP/55D Feature Phone model includes 30 programmable feature keys, an adjustable backlit display, and a full-duplex speakerphone.
• ESI 30D (digital) Business Phone — A smaller model intended for lower-traffic users.
• ESI Cordless Handset III — Available in digital, local IP, and remote IP models.
• VIP 7 Softphone — Combines the functionality of a desktop IP phone and the VIP 7 product in one PC-based phone. All ESI IP phone models are standards-compliant and operate with the customer’s data network to provide highest quality voice through Quality of Service (QoS) support. In addition, all ESI desktop IP phone models support Power over Ethernet (PoE).

ESI CS-100



FOR ESI Communications Servers
ESI-1000 • ESI-600 • ESI-200 • ESI-100 • ESI-50
Covering these current ESI phone models:
ESI 60 Business Phone • ESI 40 Business Phone • ESI 30D Business Phone
48-Key Feature Phone • ESI Cordless Handset II
. . . and these legacy ESI phone models:
24-Key Feature Phone • 12-Key Feature Phone • [Original] ESI Cordless Handset

About ESI
ESI (Estech Systems, Inc.) designs and manufactures high-performance phone systems for businesses and organizations. ESI
uses advanced technology to design IP and digital communications systems that integrate built-in capabilities, advanced features,
and highly differentiated applications into flexible products that are easy to use and keep employees productive. ESI has sold over
250,000 business communications systems through hundreds of factory-trained Certified Resellers. Founded in 1987, ESI is a
privately held corporation with headquarters in Plano, Texas.

Click a phone for the quick reference guide and overview:

esi 60D/IP, Business phone systems

60D phone

esi 55D business phone Business phone systems

55D phone

ESI 30D Phone, Business phone systems

30D phone

esi 48-button business phone, Business phone systems

48-button phone

ESI cordless II, business phone system,

Crdlss 2

esi Mobile messeging, Business phone systems

Mobile msg