Static Routes

To use enterprise SIP trunks over a dedicated internet connection, static routes must be configured to properly route packets for the trunks.  An enterprise SIP trunk uses a SIP server with a public IP address, but communication with this server uses a dedicated internet connection via a specific network adapter on the UCX system.  A static route directs all packets associated with the SIP trunk via the specific network adapter (i.e., over the dedicated internet connection) instead of sending them using the default route.

To create a static route, perform the following steps:

  1. Open the UCx Web-based Configuration Utility
  2. From the System tab, select Network
  3. From the left side column, select Static Routes

  1. Click on New Static Route button
  2. Enter the IP address of the SIP trunk server in the Destination IP Address field
  3. Enter the mask of the SIP trunk server's subnet in the Destination Subnet Mask field
  4. Select the network interface used for the dedicated internet connection in the Network Interface field
  5. Enter the IP address of the gateway (router) on the subnet of the selected network interface in the Gateway IP Address field
  6. Click on the Save button


Update SIP Settings

After adding a static route, it may be necessary to adjust the IP Configuration on the SIP Settings page.

Using the following example of a dedicated connection for the SIP trunk:

  • Dedicated Interface: eth1
    • IP address : 200.100.0.25
    • Mask: 255.255.255.0
    • Gateway: 200.100.0.1
  • SIP Trunk IP address 155.5.5.5:5060

There are three possible scenarios:

  1. If the SIP Settings - IP Configuration is set to Public IP, no changes are required.  In this configuration, the IP address of the network adapter used for communications with the SIP trunk provider will be used for SIP and RTP packets sent to the provider.
  2. If the SIP Settings - IP Configuration is set to Static IP and the customer has no external SIP devices (phones) that use the currently configured static IP address, the IP address of the dedicated network adapter (e.g. 200.100.0.25) can be entered in the External IP field.  In this configuration, the SIP trunk will be considered an external device and as such the configured External IP address will be used for SIP and RTP packets sent to the provider.
  3. If the SIP Settings - IP Configuration is set to Static IP and the customer has external SIP devices (phones) or if the SIP Settings - IP Configuration is set to Dynamic IP, the IP address (e.g. 155.5.5.5 / 255.255.255.255) or Subnet (e.g. 155.5.5.0 / 255.255.255.0) of the SIP trunk must be added to the list of Local Networks.  In this configuration, the SIP trunk will be considered a local device and as such the IP address of the network adapter used for communications with the SIP trunk will be used for SIP and RTP packets sent to the provider. External SIP phones will use the configured External IP address, while the SIP trunk will use the IP address of the dedicated network adapter.
     
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dedicated connection