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I am working on a 3CX VOIP install for a school district. The server is hosted on  Hyper-V. New phones are supposed to be identified via pnp via 224.0.1.75. However, this is not working via two 2930 Aruba switches. I have attempted to manually configure the switches with IP igmp and static groups, but the 3CX server does not see the new phones come online. I could use a config example of how to get two switches configured with multicasting with the 3CX server connected to one of the switches.

The server indicates it is listening on 224.0.1.75: ens192
        link  33:33:00:00:00:01
        link  01:00:5e:00:00:01
        link  33:33:ff:9a:fe:a6
        link  01:00:5e:00:01:4b
        inet  224.0.1.75
        inet  224.0.0.1
        inet6 ff02::1:ff9a:fea6
        inet6 ff02::1
        inet6 ff01::1

are you using VLAN trunking to the IP Phone? if so perhaps you can use DHCP option 132 to assign the VLAN for them and then igmp could kick in.

I am working on a 3CX VOIP install for a school district. The server is hosted on  Hyper-V. New phones are supposed to be identified via pnp via 224.0.1.75. However, this is not working via two 2930 Aruba switches. I have attempted to manually configure the switches with IP igmp and static groups, but the 3CX server does not see the new phones come online. I could use a config example of how to get two switches configured with multicasting with the 3CX server connected to one of the switches.

The server indicates it is listening on 224.0.1.75: ens192
        link  33:33:00:00:00:01
        link  01:00:5e:00:00:01
        link  33:33:ff:9a:fe:a6
        link  01:00:5e:00:01:4b
        inet  224.0.1.75
        inet  224.0.0.1
        inet6 ff02::1:ff9a:fea6
        inet6 ff02::1
        inet6 ff01::1

I apologize for the very long delay in getting back to you. We found a workaround and got the new phone system up and running, but I am circling back to find a resolution to the issue. Option 132 is unnecessary, as the phones find the VoIP VLAN fine and receive the correct IP. However, in the current setup (Aruba 2930 switches and Hyper-V) the phones do not connect to the multicast address of the 3CX server, as they should for pnp/registration. The VM is setup on Hyper-V with external networking, so multicasting should be available, and the server indicates it is listening for multicast. Haven't discovered the fix yet.

Thanks for your original reply.

are you using VLAN trunking to the IP Phone? if so perhaps you can use DHCP option 132 to assign the VLAN for them and then igmp could kick in.

I am working on a 3CX VOIP install for a school district. The server is hosted on  Hyper-V. New phones are supposed to be identified via pnp via 224.0.1.75. However, this is not working via two 2930 Aruba switches. I have attempted to manually configure the switches with IP igmp and static groups, but the 3CX server does not see the new phones come online. I could use a config example of how to get two switches configured with multicasting with the 3CX server connected to one of the switches.

The server indicates it is listening on 224.0.1.75: ens192
        link  33:33:00:00:00:01
        link  01:00:5e:00:00:01
        link  33:33:ff:9a:fe:a6
        link  01:00:5e:00:01:4b
        inet  224.0.1.75
        inet  224.0.0.1
        inet6 ff02::1:ff9a:fea6
        inet6 ff02::1
        inet6 ff01::1

Are the phones and the 3CX server in the same VLAN? In that case, multicast should just work, unless you intentionally broke it (with ACLs or so).

If phones and server are in different VLANs, you should setup multicast routing in order to get the traffic across a VLAN/subnet boundary.

I apologize for the very long delay in getting back to you. We found a workaround and got the new phone system up and running, but I am circling back to find a resolution to the issue. Option 132 is unnecessary, as the phones find the VoIP VLAN fine and receive the correct IP. However, in the current setup (Aruba 2930 switches and Hyper-V) the phones do not connect to the multicast address of the 3CX server, as they should for pnp/registration. The VM is setup on Hyper-V with external networking, so multicasting should be available, and the server indicates it is listening for multicast. Haven't discovered the fix yet.

Thanks for your original reply.

are you using VLAN trunking to the IP Phone? if so perhaps you can use DHCP option 132 to assign the VLAN for them and then igmp could kick in.

I am working on a 3CX VOIP install for a school district. The server is hosted on  Hyper-V. New phones are supposed to be identified via pnp via 224.0.1.75. However, this is not working via two 2930 Aruba switches. I have attempted to manually configure the switches with IP igmp and static groups, but the 3CX server does not see the new phones come online. I could use a config example of how to get two switches configured with multicasting with the 3CX server connected to one of the switches.

The server indicates it is listening on 224.0.1.75: ens192
        link  33:33:00:00:00:01
        link  01:00:5e:00:00:01
        link  33:33:ff:9a:fe:a6
        link  01:00:5e:00:01:4b
        inet  224.0.1.75
        inet  224.0.0.1
        inet6 ff02::1:ff9a:fea6
        inet6 ff02::1
        inet6 ff01::1