68 Chapter 6 Setting up the private VoIP networkN0075588N0075588Firewall information is set up under the NAT and Filters heading, which is located underConfiguration > Data Services. If you are not familiar with setting up firewall filters on the SRG,refer to the BCM 4.0 Networking Configuration Guide chapter about Configuring IP FirewallFilters.Meridian Customer Defined Network (MCDN)MCDN is automatically activated when the system is converted to SRG operation. To ensure thatredirected IP telephones can transfer calls to the SRG local telephones, trunk anti-tromboning(TAT) must be enabled.To enable MCDN TATUse Element Manager to enable TAT by selecting the TAT checkbox at Configuration >Telephony > Dialing Plan > Private Network > Dialing Plan - Private Network panel >MCDN subpanel (see Figure 14).Output filtersSource IP IP address range for Normal modeIP telephones behind the firewallIP address range for Local mode IPtelephones behind the firewallSRG VoIP gateway IPSource Port 5000 5200-5201 51000-51184 28000-28511Destination IP Main office TPS ALLDestination Port 4100, 5100, 7300 ALLTable 15 SRG firewall filters for IP telephones and trunks (Sheet 2 of 2)Filter valueNormal mode IP telephones Local mode IP telephones VoIP gatewayUniSTIM rtp/rtcp
