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Configuration: Basic 
Advanced
TCP/IP
Multicast
Multicasting is a form of limited broadcast. UDP is used to send datagrams to all computers in a host group, one or more hosts identified by the same destination IP address. The following statements apply to host groups:
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Anyone can join or leave a host group.
There are no restrictions on the host location.
There are no restrictions on the number of members that may belong to a host group.
A host may belong to multiple host groups.
Multicasting is useful when the same data needs to be sent to more than one device; for example, if one device is responsible for acquiring data that many other devices need. Using multicasting uses less network bandwidth than sending the same data to individual devices.
Multicasting also enables you to receive multicast video streams from multicast servers. The voice gateway supports an Internet Group Management Protocol (IGMP) proxy that handles IGMP messages. When enabled, the voice gateway acts as a proxy for a LAN host making requests to join and leave multicast groups.
Multicast fields
Field | Description |
Enable IGMP | Enables an IGMP proxy for multicast messages. The voice gateway acts as a proxy for a LAN |
Multicast | computer requesting to join or leave multicast groups. |
VT2142 Voice Gateway User Guide | 36 |