In a standard Huawei "Back-to-Back" (B2B) firewall traversal architecture, extranet endpoints (those outside the corporate network) do not register directly to the intranet SC. Instead, they register to the SC located in the DMZ (Demilitarized Zone) . The DMZ SC acts as the Traversal Server (TS) , while the intranet SC acts as the Traversal Client (TC) . This setup ensures that the internal network remains secure, as only the DMZ-based SC is exposed to the public internet to handle signaling and registration for external sites.
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