Configuring a port on the Phone to register as an extension on a remote system

If there is an unused port(line) on the handset, you can configure it to register as an extension on a remote PBX, from the Com.X GUI.

Navigate to the hardware page and select the port from the port tree. Right-click and select Edit.

FIELD	DESCRIPTION
Enable	If not ticked, the line will not be available for configuration.
Local Extension Port	If enabled, SIP Server, Register Login and Register Password fields will be automatically populated. Disable this option to manually enter configuration details and register an extension on a remote system.
Label on Phone	Enter the label you would like to see on the phones display.
Register Login	If Local Extension Port is disabled, this field can be edited to contain the authorisation name for an extension on a remote system.
Register Password	If Local Extension Port is disabled, this field can be edited to contain the password for an extension registering on a remote system.
SIP Server	If Local Extension Port is disabled, this field can be edited to contain the IP address of the remote SIP server on which the extension is registering.
SIP Server Port	If Local Extension Port is disabled, this field can be edited to contain the port on which the extension should register on the remote system.
Use Outbound Proxy	If enabled, an outbound proxy can be configured through which to register the extension.
Outbound proxy	The address of the outbound proxy through which the extension registers with the remote system.
Outbound Proxy port	The port of the outbound proxy through which the extension registers on the remote system.
NAT Traversal	If enabled, the phone will use NAT to locate its remote host.

Note: In order for a line on a managed Sip phone to register as an extension on a remote system, correct routing needs to be configured on both systems. This would require a route to allow the phone to connect to the external network through the correct interface, and a corresponding route on the remote system, directing traffic to the phone to the correct interface.

1.5 Administrator's Guide