| http://www.w3.org/ns/prov#value | - Thus, because signaling messages pass through the firewall or NAT device continually, a fixed port may be maintained for the passed message stream by the firewall or NAT device; in addition, when the registration messages pass through the SBC, the information, such as the ports and the IP address of the third layer of the firewall, will be recorded, and this information will be recorded together w
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