User guide

System Administrator’s Guide – Release 7.5
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Revised: April 9, 2013
Page 145
The following sections describe some common configurations and solutions to
potential problems.
17.1.2 Difficulty Connecting Calls
If the remote device does not register with the server or if calls to and from it cannot be
connected, settings on the firewall and the phone or port expander may have to be
changed to enable communications through the firewall. Perform the following steps
on the handset (using soft keys) or port expander:
1. Go to Config > Network Settings menu for phones. Go to Config Mode
page for port expanders. Change the following settings:
• DHCP – Disabled
• Remote Plug ‘n’ Play key – Set according to the procedure in, Phone or
Port Expander behind a 3rd-Party Firewall on page144.
• Boot Server IP – Set according to the procedure in, Phone or Port
Expander behind a 3rd-Party Firewall on page144.
• Phone/Port Expander IP – Choose an address that is consistent with the
remote site’s network.
• Netmask IP – Network Mask of the remote site’s network.
• Gateway IP – Gateway IP of the remote site’s network.