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3CX Phone System for Windows System for Windows
Page 57
Fax service settings
3CX Phone System includes a Fax server service which is able to receive T38 fax calls. If
your gateway supports T38, it can forward T38 fax calls to this fax server service via SIP.
The Fax server service will then receive the fax and forward the fax as an email. The Fax
server service operates as a virtual extension and logs into the SIP server just as an
extension would. Therefore you need to specify an authentication ID and password for
the fax server service to use. Furthermore you can specify a default email address to
which faxes should be sent unless specified otherwise using for example a DID route.
Special FAX Extension Number -
specify the fax extension number. Any call
forwarded to this extension will be assumed to be a fax and receive a fax tone.
FAX Authentication ID and Password – These credentials will be used to login to the
SIP server by the sip service.
FAX Default Delivery Address – Specify the default email address to send received
faxes to.
STUN Server Options
You can specify a STUN server to use for external IP address resolution. You can
optionally specify a custom port. The default port number is 3478. You may also adjust
the interval between one check and another. The default interval is 1200 seconds (20
minutes). More information about STUN servers can be found here:
Screenshot 22 – Stun server options