The C2W (CallBridge to WeBridge Connection) is always configured on the CallBridge (CMS Core) under Configuration > API > Webbridges.
The reason is that the C2W connection must be initiated from Inside Zone to DMZ Zone so that an entry in the connection table in the Firewall Core will be created permanently > Providing a Firewall Traversal Solution or mechanism for External User. This mechanism of traversing the firewall is similar to the MRA Traversal Zone where Expressway-C initiates a permanent connection traversal to Expressway-E.
