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Old 03-22-2022, 12:39 PM
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The SIP trunk must be terminated to an SBC located in the network DMZ. The DMZ should be flanked by two firewalls, one facing the external side and the other internal but most often there is only one firewall used for the external side. The firewall port forwards the necessary traffic for oneX (TLS, SRTP, etc) to the SBC-E external interface (B1) which then securely proxies the traffic to the internal interface (A1) facing the PBX based on configured policy.
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