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For Business to Business calls, which option must be configured on an Expressway Edge to route calls to an unknown domain?

For Business to Business calls, which option must be configured on an Expressway Edge to route calls to an unknown domain?
A . SIP trunk to a public DNS server
B . traversal zone to a public DNS address
C . DNS zone and a public DNS address
D . neighbor zone to the other business

Answer: C

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