| http://www.w3.org/ns/prov#value | - In a similar manner, the signaling entity 504 can also communicate with the FW/NAT entity 508 directly using a protocol such as MIDCOM. Depending upon configurations and system requirements, it is noted that a different low-level protocol may be used, between the SIP BE media entity-2 506 and the SIP BE FW/NAT entity 508 should they be located in different physical locations.
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