Configuring Fax Server
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3CX Phone System includes a fax server that allows you to receive faxes. 3CX Fax Server is based on the T.38 standard protocol and requires a compatible supported T.38 VoIP gateway or provider. VoIP providers and gateways must be configured according to our configuration guides, so that fax reception is enabled. It is also possible to use a VoIP provider that does not support the T.38 protocol, however, the quality of the fax implementation between VoIP providers varies and therefore can not be guaranteed.
Fax Receiving Configuration
To receive faxes, you must configure a line or a DID to be dedicated for receiving of faxes, so that all calls on this number are forwarded to the 3CX Fax Server. The 3CX Fax Server will then receive the fax, convert it to PDF and email the fax to the configured email address. To configure fax reception:
- In the 3CX Management Console, select the Inbound rule for the port or DID which will be dedicated for receiving faxes.
- From the “Office hours” routing options, select “Send fax to email of extension”.
- Select the extension that should receive incoming faxes. If you select “Default Email Address”, incoming faxes will be sent to the email address configured for the virtual fax extension number. You can configure the email address of the default virtual fax extension from the “Fax Machines” and select “888” then click “Edit Fax Extension”.
- Alternatively you can forward incoming faxes to the email address configured for a user’s extension. This even allows you to create multiple DID rules and give personal fax numbers.
Configuring Fax Machines / Fax Servers
The “Fax machines” node in the management console lists all known “Fax extensions” including the extension used by the 3CX Fax Server. These “Fax extensions” are similar to a normal extension and require an authentication ID and password to login to the SIP server.
3CX Phone System included a pre-configured fax extension (ext: 888). This extension is used by the 3CX Fax Server for incoming fax calls, which will then be routed to an email address. In addition, 3CX Phone System can be configured to proxy fax calls (T.38 traffic) to a fax machine connected to an ATA or another software based T.38 fax server, by creating additional fax extension.
Step 1: Creating a Fax Extension
To create a new fax extension:
- In the 3CX Management Console, select “Fax machines” > “Add Fax Extension”.
- In the “Fax Server Extension Number” field, specify the fax extension number. Any calls forwarded to this extension will be assumed to be a fax and receive a fax tone.
- Specify the Fax Server Authentication ID and Password – These credentials will be used by the ATA / 3rd party fax server to login to 3CX Phone System.
- If this extension is used by the 3CX Fax Server, you can specify the default email address to which all faxes should be sent to.
- If this extension is used for an ATA or 3rd party T.38 fax software, the extension will be used only to register to the SIP server and receive T.38 fax traffic.
- If the fax extension is created to be used for an ATA or 3rd party T.38 fax software, you can configure the “Outbound Caller ID” to be sent when an Outgoing Fax call is made.
Note: You must restart the fax service for these changes to take effect.
Step 2: Connecting a Fax Machine using an ATA to the Fax Extension
Once you have configured the fax extension you can connect the fax machine to a supported ATA device and configure the ATA device to connect to the fax extension. The guide Configure Your Fax Machine with 3CX Phone System outlines this process step by step.
- Find out How to Setup Inbound Fax Routing in 3CX Phone System.
- Read more about Fax Configuration with 3CX Phone System.