Refer to the exhibit. When Expressway-E routes a call with URI 4040@uclab.local to a DNS zone, which DNS server does the Expressway query for the SIP SRV records?

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300-820 · Question #107

Refer to the exhibit. When Expressway-E routes a call with URI [email protected] to a DNS zone, which DNS server does the Expressway query for the SIP SRV records?

The correct answer is A. 10.20.20.20. When an Expressway resolves a call via a DNS zone, it queries the DNS server(s) configured specifically within that DNS zone's settings, not the system-level DNS server configured in the Expressway's network settings. In the exhibit, the DNS zone on the Expressway-E is…

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Question

Refer to the exhibit. When Expressway-E routes a call with URI [email protected] to a DNS zone, which DNS server does the Expressway query for the SIP SRV records?

Exhibit

Options

A10.20.20.20
B10.10.10.10
C10.40.40.40
D10.30.30.30

How the community answered

(34 responses)

A
85% (29)
B
3% (1)
C
3% (1)
D
9% (3)

Explanation

When an Expressway resolves a call via a DNS zone, it queries the DNS server(s) configured specifically within that DNS zone's settings, not the system-level DNS server configured in the Expressway's network settings. In the exhibit, the DNS zone on the Expressway-E is configured with 10.20.20.20 as its DNS server address. Therefore, when the Expressway-E routes the call for [email protected] to the DNS zone, it sends the SRV record query to 10.20.20.20. The other IP addresses (10.10.10.10, 10.30.30.30, 10.40.40.40) represent either the system DNS or other servers configured elsewhere, but the DNS zone's own configured server takes precedence for zone-based lookups.

Topics

#Expressway-E#DNS Resolution#SIP SRV Records#Call Routing

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