# Change IP-Fax Gateway Settings
Device Management > Configuration > Fax > IP-Fax Gateway Settings > Change IP-Fax Gateway Settings

Register and update the VoIP gateway to use the IP-Fax function. You can register up to 50 VoIP gateways.

Note

- Settings on this page can be changed by the following administrators and users:
  - Network Administrator
  - Users logged in to a device that is set to perform user authentication
    Users must have normal fax operation rights and permission to change settings that usually only administrators can change.

### Prefix

Enter the VoIP gateway's phone number. You can enter up to 12 characters consisting of digits and symbols (# * -).

### Protocol

Select a protocol for IP-Fax transmission or newly registered additions to the Address Book.
Select either H.323 or SIP.

### Gateway Address

Enter the VoIP gateway's IP address or host name. Up to 128 alphanumeric characters can be entered. A port number can also be specified after a colon ":".

Note

- Symbols that can be used are:
  ; ? : & = + $ , - _ . ! ~ * # ' ( ) % / @ [ ]

## Buttons

### Refresh

Click to update the currently displayed information.

Note

- Before making the settings, click Refresh to obtain the machine's current status.

### OK

Click to apply the settings.

### Cancel

Click to cancel the settings.

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