FujiFilm Apeos C7070 Reference Manual page 43

Symptom
Unable to communicate
(IP fax (SIP)).
Set a correct IP address, subnet mask, and gateway address in the
machine.
Set a correct SIP address in the machine.
Set a correct IP address of the SIP server in the machine.
Confirm with your network administrator whether the SIP server is
operating correctly.
Registration of the machine information to a SIP server has failed.
Switch the machine power off and then on.
The data cannot be sent if the IP fax (SIP) machine of the recipient is
turned off. Check the machine condition with the recipient.
The method for specifying the recipient is incorrect. Specify the
following recipient information.
Neither a SIP server nor a VoIP gateway is used: Specify "SIP user
name@IP address" in [Recipient].
Only a SIP server is used: Specify "SIP user name" or "telephone
number" in [Recipient].
Only VoIP gateway is used: Specify "telephone number" in [Recipient].
Both SIP server and VoIP gateway are used: Specify "SIP user name" or
"telephone number" in [Recipient].
When using a feature such as the Polling feature, confirm whether the
destination fax supports the feature.
When the Authentication/Accounting feature is used and you send a
fax directly from the computer, set the correct user ID and passcode
registered on the machine to the fax driver.
The number of simultaneous connections for IP fax (SIP) is one. The
machine cannot send and receive at the same time.
After reception of an IP fax (SIP) is completed, try sending it again.
After transmission of an IP fax (SIP) is completed, request the sender
to send it again.
Enable the port for IP fax (SIP) of the network relay device (such as a
switch, router, and firewall).
If the reception IP address has been limited on the machine in the
environment where the SIP server is used, add the IP address of the SIP
server to the reception IP address.
If the Ethernet cable has been unplugged for more than one minute,
the registration succeeds when Register recovery on the SIP server is
completed. No measure is required.
The machine cannot receive a fax when switched off. Switch the
machine power on.
The machine cannot receive a fax in the Administrator Mode. Exit the
Administrator Mode.
When a reception password has been set, the machine accepts only
data or polling fax sent with the correct reception password in F code.
Cause/Remedy
2.7 Troubleshooting
43