Which one of the following statements about the SIP-NAT is TRUE?
The Net-Net 4000 uses the SIP-NAT element to rewrite the contact-URI, the Via header and the SDP.
The Net-Net 4000 uses the SIP-NAT to provide translation between a home address space and an external address space.
The Net-Net 4000 uses the SIP-NAT to act as a service pipe to SIPD.
You must have at least one SIP-NAT to route traffic between realms.
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