Specializing in  digital and VoIP business phone systems

Cargill Telecommunications installs business phone systems and is located in Temecula, CA. We service Southern Riverside, Northern San Diego  and Orange Counties. We provide premise based digital and VoIP business phone systems. As well as cloud business telephone systems. We provide service, installation, trouble analysis and maintenance. We also install and certify structured data, fiber optic, telephone, paging and speaker wiring.

We are dedicated to provide outstanding business phone systems, products and services to our customers. Adding one line or installing a complete phone system, sound system or data network quality is always first. We aim to fit the right phone system technology to your companies needs by providing expert advise with our extensive experience in the telecommunications industry. We can order your phone service so you have only one point of contact to request changes or report trouble.

Cargill Telecommunications is an Authorized ESI dealer. And a California C7 contractor. License C7-819414

Since 1987, ESI has designed and manufactured innovative business phone systems for small and midsize businesses. ESI’s award-winning products deliver all the important features businesses need. And are incredibly easy to use and yet are very affordable. ESI not only provides business phone systems they provide business phone services also. SIP trunking or hosted PBX to work as a whole phone system or to augment your existing services.

In addition to phones on your desk you can also add access/presence control and video surveillance, all from your business phone system. Just press a button on a pre-programmed phone to allow access for a visitor at your door, whether the door is located in your building or at a remote site. ESI provides the simplest and most flexible business phone system available for your office staff.

Using unified messaging you will never need to miss an important message again.

50% of workers experience
project delays on a weekly
basis because a key decision
maker can’t be reached.

22% of monthly deadlines
are missed because the
right person can’t be found
at the right time.


  1.  Helps Improve Productivity. Faster decision-making, improves call handling for better customer service.
  2. Grows With Your Business. Expands simply when needed.
  3. Easy Installation.
  4. Use with any broadband service or traditional phone services
  5. Control Communication Costs. Eliminate up front maintenance with unification of services.
  6. Premium Business Phone Systems with unique capabilities
  7. High-definition voice quality.
  8. One platform to maintain your telephone system, access control and video systems
  9. On board call logger on premise and hosted business phone systems. No need for an extra server on site.
  10. A single point of contact for maintenance, changes and trouble reporting for your system and service.



Click a phone or a phone system for a quick reference guide and overview:

business phone systems

48-button speaker phone

business phone systems

60 IP or digital speaker phone

ESI Phones business phone systems

30D speaker phone

ESI cordless II, business phone system,

ESI cordless II

business phone systems

Mobile Msg







ESI 50, ESI 50L business phone systems

CS-50 and 50L

ESI CS-100 business phone systems


 esi help videos, esi CS-200, esi 60D, esi 40D, esi help video answering calls, business phone system

CS-200 Hybrid PBX

business phone systems

IP-900 Server



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