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Intercom groups are processed using multicast. Each speaker or phone needs to have the appropriate multicast listening address programmed in.
Below is a list of which multicast groups go to what section:
Extension / Name / Address
2000: LE All Call: 224.0.20.0:50001
2001: LE Bells: 224.1.20.0:50001
2100: Pre-K: 224.0.21.0:50001
2200: Kindergarden: 224.0.22.0:50001
2300: 1st: 224.0.23.0:50001
2400: 2nd 224.0.24.0:50001
3000: UE All Call: 224.0.30.0:50001
3001: UE Bells: 224.1.30.0:50001
3100: 3rd: 224.0.31.0:50001
3200: 4th: 224.0.32.0:50001
3300: 5th: 224.0.33.0:50001
3400: 6th: 224.0.34.0:50001
4000: JH: 224.0.40.0:50001
4001: JH Bells: 244.1.40.0:50001
5000: HS: 224.0.50.0:50001
5001: HS Bells: 224.1.50.0:50001