TGM550 IP Addressing Guidelines

For operational purposes, the TGM550 is identified as a host on the Services Router. Hence, the TGM550 needs to be assigned an IP address that is reachable both externally and internally from the Services Router. The TGM550 uses this IP address to identify itself when communicating with other devices, particularly the Media Gateway Controller (MGC).

To assign the IP address for the TGM550, you configure the destination address on the vp-pim/0/0 interface. For information about configuring the vp-pim/0/0 interface, see Configuring VoIP Interfaces with Quick Configuration or Configuring the VoIP Interface (Required).

Caution: Applying a new or modified IP address resets the TGM550. Before modifying the IP address, take the following precautions: Log into the TGM550 and enter copy running-config startup-config to save the TGM550 configuration. (For login instructions, see Accessing and Administering the TGM550 CLI.) Ensure that the TGM550 is not currently handling voice traffic.

To enable easier administration of the TGM550, we recommend the following guidelines for assigning the IP address of the TGM550:

• Assign an address from one of the subnets that is already configured in the branch office where the Services Router is installed.
• Decide on a block of IP addresses for VoIP services, and assign an IP address from that block to the TGM550.
• Do not assign the following IP addresses to the TGM550:
  • A broadcast address (255.255.255.255)
  • A class E address (240.0.0.0 to 255.255.255.254)
  • A loopback address (127.0.0.0 to 127.255.255.255)
  • A multicast address (224.0.0.0 to 239.255.255.255)
  • An address with 0 as the first byte or an address with 0 or 255 as the last byte