Which two internal SIP endpoints behind a firewall place calls to external devices? (Choose two.)

Question

Options

• AAn Expressway-C communicates with the internal endpoint and forwards the media to and from
• BA Cisco Endpoint is configured with a publicly routable static NAT SIP address to advertise
• CAn Expressway-C communicates directly with the remote party using the ICE protocol
• DAn Expressway-E is used as a VPN server to allow remote SIP edge servers to connect calls
• EAn Expressway-C rewrites the SIP SDP to advertise its own IP address to the external party.

• A
  82% (31)
• C
  3% (1)
• D
  11% (4)
• E
  5% (2)

Explanation

Option A: The Expressway-C acts as a back-to-back user agent (B2BUA), terminating the call from the internal endpoint and forwarding signaling and media outbound toward the remote party-this is the standard Expressway traversal model. Option B: An endpoint configured with a publicly routable static NAT address advertises that external IP in its SIP SDP, allowing direct media exchange without a traversal server. The other options are incorrect: Expressway-C does not directly contact remote parties using ICE (that is handled through Expressway-E traversal), and Expressway-E is not a VPN server.

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