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ComShare 550

Telephone Line Sharing System/Fax Switch

Command Communications 3-Port Phone/Fax Modem Line Sharing Device  (2 linked + 1 individual).The model 550 was Command's first programmable switch. The ComShare 550 had no Caller ID support. The Line Routing Switch 4.1 is the closest and best replacement for ComShare 550 – a large improvement too! Unlike the CS 550, it has perfect Caller ID support when the phones are connected through the switch and so much more.

The ComShare 550 is discontinued. The perfect replacement is Line Routing Switch 4.1.

LineShare 4.1- Line Routing Switch 4.1 ™ is the best new line sharing technology in the world today. This is perfect replacement for the Comshare 550 or any Command Communications products. Like the CS 550, the Line Routing Switch 4.1 ™ is fully programmable. Almost every function that any switch that Command Communications ever made is included in this product plus more. Caller-id, Call waiting, and almost all of the phone company features are standard.

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

ComShare 550 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. The Line Routing Switch 4.1 not only offers this passive mode but also automatic and distinctive ring modems. It can even do both at the same time.

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 closest an superior replacement – the user no longer needs to configure for the home mode of operation. 

ComShare 550 Description

From Command Communications
(the former manufacturer)

Command Communications 3 port fax switch

Save money by eliminating dedicated phones lines. The ComShare 550 is a state-of-the-art Telephone Sharing Device which provides simultaneous connections of up to three separate telecommunications peripherals products utilizing a single telephone line.

No professional installation is required-simply plug it into an existing phone jack anywhere on the line, connect the peripherals, and the ComShare 550 is fully operational. Perfect suited for the Home or Small Office/Home Office, the ComShare 550 quickly directs incoming telephone calls to the one of the three appropriate destinations.

  • 3 Port device (2 ports are linked)
  • For use with devices such as telephones, answering machines, fax machines, modems, etc.
  • 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
  • CS550

Alternative Product Description

Command Communications ComShare 550 is a 3 port manual 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 550

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 550
  • Item model number: 550

Product Details

  • Shipping Weight: 3 pounds
  • Item model number: CS550
  • Discontinued by manufacturer: Yes


The ComShare 550 is discontinued. The replacement is Line Routing Switch 4.1.


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 similar but superior products for over 25 years. Feel free to call toll free at 1-866-337-0965 for assistance in replacing your comshare or finding a superior product for your particular application.

The correct product to replace the CS 550 is the Line Routing Switch 4.1. The Line Routing Switch 4.1 is a tone detection product that automatically routes calls to the proper device without the need for any additional phone company services.

If you want use distinctive ringing service to route your calls, the Line Routing Switch 4.1 is also the correct replacement.

The Line Routing Switch 4.1 will also do the manual transfer from your phone if you require it or want it to workl exactly like your CS 550 did.

The superior replacement for the Command Communications 550 automatic, semi-automatic (passive) or distinctive ring fax or modem detection is Line Routing Switch 4.1.

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.

Basically it works like having two or three lines except you can't use them at the same time and you only have one number in auto mode or two or three numbers in distinctive ring mode on a single phone line.


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 $ 5500.00 $ 6000.00
$ 60.00 $ 720.00 $ 2160.00 $ 3600.00 $ 7200.00


How much is eliminating two lines or using Magic Jack Plus and getting rid of your phone line completely 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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