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# When using a gatekeeper server or SIP server

The IP-Fax destination details that you must specify vary depending on the machine's configuration and the configuration of the network to which it is connected.

Depending on this machine's configuration, specify the IP-Fax destination as follows:

When not using a gatekeeper/SIP server

- From IP-Fax to IP-Fax

  Specify the IP address or host name of the receiving machine.

  Example: 192.168.1.10 (IP address)

  Example: IPFAX1 (host name)

- From IP-Fax to G3 fax

  Specify the G3 fax telephone number of the receiving machine.

  Example: 0312345678

When using a gatekeeper server

- From IP-Fax to IP-Fax

  Specify the alias telephone number of the receiving machine.

  Example: 0311119999 (alias telephone number)

- From IP-Fax to G3 fax

  Specify the G3 fax telephone number of the receiving machine.

  Example: 0312345678

When using a SIP server

- From IP-Fax to IP-Fax

  Specify the SIP user name of the receiving machine.

  Example: ABC (SIP user name)

- From IP-Fax to G3 fax

  Specify the G3 fax telephone number of the receiving machine.

  Example: 0312345678

- To send to a G3 fax via a gateway connected to a public telephone line, you must specify it's the receiver's machine telephone number. For example, if the receiver's fax number is “0312345678”, specify “5678”. To send from an IP-Fax to G3 fax without using gatekeeper or SIP server, you must register the gateway also.

- An alias telephone number is a number that is registered in the gatekeeper, and is available only in the network to which the gatekeeper is connected.

- Pay attention to the number of telephone number digits set in the gateway/IP address conversion table to avoid transmission error.

- SIP allows you to transmit and receive documents via an IPv6 network. This machine does not support H.323 over IPv6.

- Although the machine can have multiple IP addresses in an IPv6 environment, only one address can receive IP-Faxes.

- To send via IPv6, you must specify, for the receiver's IPv6 address and host name, the manually configured address for the receiver's fax.

- For reception when not using SIP server in an IPv6 environment, you must specify this machine's IPv6 address manually. This is not necessary if you are using SIP server.

- To send by IPv4 when using SIP server in a mixed IPv4/IPv6 environment, enter “v4:” at the beginning of the IP-Fax destination. Likewise, to send by IPv6 when using SIP server in a mixed IPv4/IPv6 environment, enter “v6:” at the beginning of the IP-Fax destination.

- “SIP call setup” is performed either by IPv4 or IPv6, depending on the configuration of your environment.