300-820 · Question #91
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
The correct answer is A. connection. When Expressway-E is configured with a static NAT address (its public IP), it updates the SDP 'connection' attribute - the 'c=' line - to advertise the public IP address instead of the private DMZ address. The connection line tells remote endpoints where to send media…
Question
Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?
Options
- Aconnection
- Bname
- Cversion
- Dbandwidth
How the community answered
(39 responses)- A92% (36)
- C5% (2)
- D3% (1)
Explanation
When Expressway-E is configured with a static NAT address (its public IP), it updates the SDP 'connection' attribute - the 'c=' line - to advertise the public IP address instead of the private DMZ address. The connection line tells remote endpoints where to send media (audio/video). Without static NAT configuration, Expressway-E would advertise its internal DMZ IP in the SDP, which is unroutable from the internet. By configuring the static NAT public IP, Expressway-E ensures external callers can reach it for media exchange. The other SDP attributes - name (s=), version (v=), and bandwidth (b=) - are not affected by NAT address configuration.
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