Deployment of UCX in a Network

Network Parameters

UCX Server is a network device that will be connected to your local area network (LAN). You must select a fully qualified domain name (FQDN) for this device and an IP address that will be used by the device. You should also prepare network configuration parameters that will be used for the configuration of the UCX Server's network adapter.

UCX Server can be configured to act as a DHCP client (thus obtaining the IP address and network configuration parameters from the DHCP server on your LAN). If you want to use the DHCP client configuration, you would have to ensure that all telephones will be able to locate the UCX system. This can be achieved in several ways (for example by using your DHCP server to provide the server address for telephones or by using the UCX system's domain name in the configuration of telephones). For certain types of telephones the IP address of the server is required (the server name is not accepted).

To simplify the configuration of telephones, we recommend either the use of a static IP address for your UCX Server or using an association of the MAC address of the UCX Server with a specific IP address from the IP address pool of your DHCP server. Both of these options ensure that the IP address of your UCX Server will not change and reconfiguration/reboots of telephones will not be required.

The remote access server assigns virtual IP addresses ranging from to for remote systems. To avoid IP address conflicts, do not use IP addresses in the same range for your UCX system.

The following table provides a list of network configuration parameters that you should prepare:


Default Value

Selected Value

Host name


___________________________ (FQDN)

IP address type


Static / DHCP

Static IP address


Subnet mask


Gateway IP address


Primary DNS Server



Secondary DNS Server



If you have a UCX20, UCX50 or UCX250, the Front Panel Display (FPD) will show the assigned IP address. If "No IP Address" is displayed, this is an indication that there is an IP address conflict or DHCP mode is selected and there is no DHCP server.

See Using the FPD to reset network configuration for details on how to reset your UCX Server's network configuration back to factory default.

Other Network Considerations

Separate Voice LAN

The following diagram shows how UCX can be deployed in a network with a separate LAN for voice traffic. The advantages of having a separate voice network is improved voice quality and reliability, better security and problem isolation, See Configure a Second Network Port for configuration instructions.

Adding Local Subnets to Do Not Block list

The UCX feature IP Block List is a security application that monitors the UCX system and temporarily blocks IP addresses that attempt to break into your system. If the UCX detects unauthorized attempts to connect to the system using the Web Server, Secure Shell, or Telephony interfaces, it will block all connections from the subnet of the source IP Address. For example, if a user on one of the local subnets attempts to log into the UCX Web-based Configuration Utility and reaches the threshold set for invalid connection atttempts, then all users on that subnet will be blocked until the block timer has expired. Similarly, if a user or service provider SIP account is configured with the wrong password the subnet entire subnet will be blocked when the number of invlaid connection attempts is reached. Therefore, it is advisable that you add either the specific IP addresses of local devices that you wish to communicate with the UCX or that you add the entire subnet(s) to the feature's Do Not Block settings as part of your initial setup.

Disable SIP ALG

On the network that routes UCX voice (SIP) traffic, we require SIP ALG be disabled. Most commercial routers have SIP ALG enabled by default. Please check the manufacturer's handbook for your device on how to disable SIP ALG. (See Unexpected call failures and registration problems for details.)