I'm planning to connect two VoIP Clusters using H323 and I have a VG in each site, I will forward the calls from the CM towards the VG and I will use VoIP dial peer to forward the call to the other site.
I just need to know the RTP stream between the End Points will be forwarded directly between IP Phones without crossing the Voice Gateway or it will cross the voice gateway?
I need to make sure that the traffic is forwarded through the Voice Gateway or by another mean the source IP Address will be the VG IP Address to avoid publishing the Internal IP Phones VLAN.
Assuming the connection between the CM and VGs are IP and not TDM then the VGs would be acting as a CUBE already
(voip in, voip out) so keep this in mind when doing the config. As Java mentioned using flow-through mode on the VG/CUBEs will mean the phones will sending RTP to the VGs IP address on each side.