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ComShare 300

Telephone Line Sharing System/Fax Switch

Command Communications 3-Port Phone/Fax Modem Line Sharing Device

The ComShare 300 is discontinued. The replacement is Line Routing Switch 4.1.

More information and more specific products are avaliable at faxswitch.com.

Feel free to call toll free at 1-866-337-0965 for assistance in replacing your comswitch or finding a superior product for your particular application.

ComShare 300 was a single line unit with 3 ports (3 linked + 1 individual).  This was a passive unit meaning it did not answer the incoming call.  It monitored the telephone line and if the FAX CNG tone or DTMF transfer codes were detected, the call was routed accordingly. 

Due to the nature of its operation, the Answering Machine/Phone port would ring on every incoming call and Caller ID was received by the connected devices.  Every phone on the line would ring and receive Caller ID.  The Line Routing Switch 4.1 is the perfect replacement. The user won't need to configure anything.. 

ComShare 300 Description

From Command Communications
(the former manufacturer)

Command Communications 3 port fax switch

Save money by eliminating dedicated phones lines. The comswitch 300 is a state-of-the-art Telephone Sharing Device which provides simiultaneous connections of up to thre separate telecommunications peripherals products utilizing a single telephone line.

No professional installation is required-simpley plug it into an existing phone jack anywhere on the line, connect the peripherals, and the ComSwitch 300 is fully operational. Perfect suited for the Home or Small Office/Home Office, the ComSwitch 300 quickly directs incoming telephone calls to the one of the three appropriate destinations.

Comswitch 300 Package

  • 3 Port device (2 ports are linked)
  • For use with devices such as telephones, answering machines, fax machines, modems, etc.
  • Automatically forwards the each to call to the appropriate devices
  • Easily share ONE line your phone, fax, and answering machine
  • No more paying for an expensive separate phone line
  • Total memory retention and normal phone telephone operation in case of power failure
  • Compatible with most fax and answering machines
  • CS300

Alternative Product Description

Command Communications ComShare 300 is a 3 port distinctive ring modem or fax switch. A 3 Port device means 2 voice ports are linked (like a jack for phone and another for answering machine) and are identical with 1 additional port for the connected device which are typically fax or modem. Typical uses include phones, answering machines, fax machines, modems, etc. Basically it lets you share two voice devices (phone and answering machine) one fax or one modem on a single line

ComShare 300

Technical Details

Product Features and Technical Details

Product Features

  • Command Communications 3 port fax switch
  • 3 Port Device (2 Ports Are Linked)
  • For Use With Devices such As Telephones, Answering Machines, Fax Machines, Modems, Etc.
  • Automatic Mode

Technical Details

  • Brand Name: Command Communications
  • Product Name: Comshare 300
  • ASIN: B000PKM9WC
  • Item model number: 300

Product Details

  • Shipping Weight: 3 pounds
  • Item model number: CS300
  • ASIN: B004MBY2Y8
  • Discontinued by manufacturer: Yes


Superior replacement products are currently supplied by Higgins International. and may be purchased online at faxswitch.com.


About the Company

Until 2011, Command Communications designed, manufactured and distributed consumer and commercial electronic communication products and accessories. Command Communications Inc in Centennial, CO was a private company categorized under Communications.

Former estimates showed this company had an annual revenue of $2.5 to 5 million and employed a staff of approximately 10 to 19. They manufactured telephone line sharing devices, fax switches, on-premise paging systems, and HDMI cables and switches. Command was also an original equipment manufacturer (OEM) for a number of major telecommunications companies in North America.

The last address for Command Communications was:

Command Communications, Inc.
14510 E Fremont Ave
Englewood, CO 80112

Unfortunately, Command Communications is no longer in business and does not support its products anymore. Fortunately, Higgins International has been involved with manufacturing and distributing similar but superior products for over 25 years. Feel free to call toll free at 1-866-337-0965 for assistance in replacing your comswitch or finding a superior product for your particular application.

The correct product to replace the 300 is most likely the Line Routing Switch 4.1. . Line Routing Switch 4.1 is a multi- function line sharing device that defaulta to the tone detection product that automatically routes calls to the proper device without the need for any additional phone company services as the ComShare 300 does.

All you will need to do is unplug your old ComShare 300 and plug in the new LRS LineShare 4.1 and everything will work the same except better.

The superior replacement for the Command Connunications 300 autimatic fax or modem detection is Line Routing Switch 4.1. Since they are 100% accurate, has surge and lightening protection as well as all parts in the manufacturing are specified for a minimum of 40 years, which the Command product never had. We are thoroughly confident that you will much happier with it. It shouldn't wear out. 40 years is a long time.

Instead of having two or three phone lines, it allows you to have only one phone line instead of paying for three lines which obviously almost cost you 3 times as much) for virtually the same functionality.

Bacically it works like having two or three lines except you can't use them at the same time and you only have one number.

With The LRS LineShare 4.1 all calls are routed to either the voice, fax or modem automatically on your single existing phone line.The Line Routing Switch 4.1 is our newesr and most up to date product. It is basically like an invisible secretary that automatically routes your calls to the correct device without the caller being aware that it isn't a dedicated line.

To learn more information about Line Routing Switch 4.1 which is the most modern fax switch in the world, go to: http://faxswitch.com

Call toll free in US or Canada 1-866-337-0965 or 1-217-337-0965 with your questions or to order by phone.


How much is line sharing worth to you?

What's it worth to your BOTTOM LINE to eliminate 1 phone line?
Monthly Line Cost 1st Year Cost/Savings 3rd Year Cost/Savings 5th Year Cost/Savings 10th Year Cost/Savings
$ 20.00 $ 240.00 $ 720.00 $ 1200.00 $ 2400.00
$ 30.00 $ 360.00 $ 1080.00 $ 1800.00 $ 3600.00
$ 40.00 $ 480.00 $ 1440.00 $ 2400.00 $ 4800.00
$ 50.00 $ 600.00 $ 1800.00 $ 3000.00 $ 6000.00
$ 60.00 $ 720.00 $ 2160.00 $ 3600.00 $ 7200.00


How much is eliminating two lines worth to you?

What's eliminating 2 phone lines worth to your BOTTOM LINE?
Monthly Line Cost 1st Year Cost/Savings 3rd Year Cost/Savings 5th Year Cost/Savings 10th Year Cost/Savings
$ 20.00 $ 480.00 $ 1440.00 $ 2400.00 $ 4800.00
$ 30.00 $ 720.00 $ 2160.00 $ 3600.00 $ 7200.00
$ 40.00 $ 960.00 $ 2880.00 $ 4800.00 $ 9600.00
$ 50.00 $ 1200.00 $ 3600.00 $ 6000.00 $ 12000.00
$ 60.00 $ 1440.00 $ 4320.00 $ 7200.00 $ 14400.00

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Call toll free in US or Canada (866) 337-0965
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