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Telephone, PBX, and VoIP Systems
Manufacturers & Services

Even with cellphones dominating personal and business communications, there is still a huge need for wired systems, especially for in-building PBX applications. Your desk phone will likely still be around for a long, long time.

My policy is to only list companies that actually manufacture product or offer services related to the page title subject. Product distributors and sales representatives are not listed (they have their own page). This helps guarantee that each listing offers a unique product or service. NOTICE: I am no longer adding hyperlinks. Your best bet is to use a search engine to find company websites directly. If you are interested in advertising, please visit my Advertising information page.

8x8, Inc |
866-879-8647 | Sunnyvale, CA
Delivers business communications solutions including VoIP phone servicem managed hosting, web conferencing, and unified communications.

AccessDirect, Inc |
877-599-6500 | Kansas City, KS
Provides affordable hosted PBX services, business voice mail, and fax services.

AVAD Technologies |
800-733-4136 | New York, NY
Small business VoIP provider of Hosted VoIP PBX phone service.

Call Management Products, Inc |
800-245-9933 | Broomfield, CO
Manufactures high quality telecommunication products that are designed to enhance telephone line productivity and provide cost savings for your home or business.

Carroll Communications |
732-280-3200 | Spring Lake, NJ
Specializes in internet telephony, VoIP and office telephone systems.

ChronosTelecom LLC |
480-522-2114 | Scottsdale, AZ
Provides small businesses PBX appliances and phone systems.

Digium |
256-428-6000 | Waltham, MA
Creator, sponsor, and innovative force behind Asterisk, the world's most popular open source telephony software.

FacetCorp |
877-322-3846 | Dallas, TX
Maker of the FacetPhone IP PBX business phone system.

IPsmarx Technology, Inc |
800-532-4893 | Reston, VA
Provides feature rich VoIP solutions.

Jive Communications, Inc |
Provides full-featured, affordable IP telephone systems to clients nationwide.

Nextiva, Inc |
800-983-4289 | Scottsdale, AZ
VoIP phone systems, virtual fax lines, business phone numbers, PBX trunk lines.

Phone Power |
888-607-6937 | Winnetka, CA
Provides residential and small business service packages, business and hosted PBX service packages.

PhoneSuite |
800-245-9933 | Broomfield, CO
Designs and manufactures high-quality telephone (PBX) systems for the hotel industry.

PBX Interactive, LLC |
888-895-PBXi | Brooklyn, NY
Specializes in business communication systems including, business telephone systems, virtual PBX systems (hosted | managed telephony), small office | home office (SoHo) telephone systems (digital and voip), voice and data cabling (Cat5e | Cat 6), virtual receptionists, virtual call centers and vanity toll free numbers for virtual offices and mobile office solutions.

866-446-8729 | Farmington Hills, MI
Provides hosted PBX & broadband VOIP telephone services for business.

Protus IP Solutions |
Maker of my1voice, affordable virtual PBX phone aervice for small business.

TalkSwitch |
888-332-9322 | Canada
Makes award-winning telephone systems for small offices that handle VoIP and traditional connections with analog or IP phones and an ever-growing set of powerful features.

Virtual PBX |
888-825-0800 | San Jose, CA
Deliver PBX call routing and other functions as a hosted service, rather than a complex piece of hardware that you have to buy, install and maintain. Offers several versions of our Virtual PBX® Service, accommodating a wide range of needs, from a startup or SOHO PBX to large corporate telephone systems and also have a unique disaster recovery/business continuity phone service for companies that already have a PBX.
Provides business VoIP & hosted PBX systems.
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RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel