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Fonality's faxing solution requires customers purchase and install 1 Sangoma PRI card and 1 Sangoma analog card. You cannot use a fax machine with PBXtra with only an analog card and analog lines. Your fax machine requires its own extension. Fax over VoIP is NOT supported.
Sangoma Fax Sync Cable
The major hurdle with Fax + an IP PBX until now has been proper timing for the fax machine. Without precise timing, the actual facsimile will become corrupt during transmission and the resulting page that prints will become unreadable.
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First - you must create a new extension for your Fax Machine. Click on Extensions --> add extension
Please read How do I add an extension? and configure the extension's options
Under the Device option for this new extension, you must select an Analog Port from the drop-down. Available analog ports will appear like Analog Port X - Zap/NUM where the X is going to be a number 1 through 12, and the NUM variable will indicate the Zap port as far as the system sees it. So a typical system with 1 analog card would say Analog Port 1 - Zap/25. The port you select from the drop-down corresponds to the analog ports physically available from the back of your server. Use the image below as a reference for the port order. Your system may only have the one card with the red circle - the image below demonstrates multiple cards and the port order increments from 1-16.
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Once you have selected the appropriate port from the Devices drop-down, click Apply All Changes
Click on AutoAnswer --> edit call menu
In the bottom right-hand corner of the page, under Add New Sequence, select after step 1, go to submenu/ext by number dialed
Click Apply All Changes
The page refreshes and you have a new call menu sequence as Step 2
From the two drop-downs in the Step 2 sequence, first select the Extension that you created earlier in these instructions
Next select the Analog Line that acts as your Fax line from the second drop down. This will appear similar to the Devices selection on the Extension page - you will see Card 1 port 1 or maybe Card 1 port 3 - it depends on how many analog ports you have provisioned for your server.
Click Apply All Changes
Click on Options --> dial plan. You may wish to watch our video about modifying dial plans if you are unfamiliar with this process How do I edit an existing dial plan?
Click on the 911 dial plan
Under the Route column, select the Analog Line option next to the 1st route option. This means calls to 911 will first be placed over your analog line before using any other type of connection on your server. If the analog line is ever unavailable, you should select Secondary and Tiertiary Tertiary routes for calls to 911 as this is a very critical phone number
Click Update Dial Plan
Your system is now fully configured to receive incoming faxes and have these calls answered by the fax machine. Your employees can also use the analog line as their primary path to call 911 in an Emergency.
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If the carrier does not provide precise timing on the PRI card, the analog card will not properly send or receive facsimiles. Please double-check the T1 configuration before escalating any issues.
For full details please refer to Sangoma's Wiki Page:
Sangoma Wiki Article
Fax Machine Goes Off Hook Immediately when Connected
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These fax machines (primarily All-In-One Printer/Fax Machine with no 'Hook' switch) require a special 2-wire phone cable instead of the common 4-wire phone cable that Fonality ships with the PBX. According to some of the fax machine User Manuals, the manufacturer normaly normally ships this special phone cable with the fax machine. HP also has a 2-wire to 4-wire adapter that can be purchased/used with any standard 4-wire phone cord commonly available.
The final alternative is to make a custom-phone cable that strips away the 2 offending wires. The 2 wires that need to be removed are the outter outer pair (Wire 2 and 5 in the diagram below).The pair that actually makes the connection between the PBX and the Fax Machine is the inner pair (Wire 3 and 4 below).
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