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# IP-Fax Functions

The IP-Fax function sends or receives documents between two facsimiles directly via a TCP/IP network.

This function has the following advantages and is suitable for communication within the same LAN:

- Reducing communication costs

- Communicating between IP-Faxes at higher speed than by standard fax

IP-Fax uses SIP and H.323 as the network protocol.

Specify an IP address or host name instead of a fax number for sending. When using a gatekeeper, specify an alias telephone number.

When using a SIP server, you can send by specifying SIP user name.

You can also transmit to a G3 facsimile connected to the public switched telephone network (PSTN) via a gateway (T.38-compliant).

Specify addresses of the gatekeeper or SIP server (proxy server, registrar server, redirect server) as appropriate under H.323 Settings, SIP Settings, or Program / Change / Delete Gateway in the Initial Settings.

You can receive IP-Faxes in the same manner as standard faxes. For details about reception, see “Types of Reception”.

- To use IP-Fax functions, this machine must be connected to a LAN and its IP-Fax settings correctly specified under Initial Settings in the Facsimile Features menu. For details about these settings, see “Initial Settings”.

- Before using this function, configure the network in the System Settings menu. For details about the required settings, see “Connecting the Machine”, Network and System Settings Reference.

- IP-Fax supported by this machine is ITU-T Recommendation T.38 compliant.

- SIP allows you to transmit and receive documents over an IPv6 network.

- For details about H.323 Settings, SIP Settings, or Program / Change / Delete Gateway, see “Initial Settings”.

- This function supports both IPv4 and IPv6 addresses.

- Types of Reception

- Initial Settings

Related topics

Terminology
Notes on Using IP-Fax
Functions Not Available for IP-Fax Transmission