300-820 · Question #42
Which zone is required on a B2B deployment between Expressway-C and Expressway-E?
The correct answer is A. traversal zone. In a Business-to-Business (B2B) video calling deployment, a standard traversal zone is configured between Expressway-C (inside the network, traversal client) and Expressway-E (in the DMZ, traversal server). The traversal zone allows SIP/H.323 signaling and RTP media to traverse…
Question
Which zone is required on a B2B deployment between Expressway-C and Expressway-E?
Options
- Atraversal zone
- BDNS zone
- Cdefault zone
- Dneighbor zone
How the community answered
(23 responses)- A91% (21)
- C4% (1)
- D4% (1)
Explanation
In a Business-to-Business (B2B) video calling deployment, a standard traversal zone is configured between Expressway-C (inside the network, traversal client) and Expressway-E (in the DMZ, traversal server). The traversal zone allows SIP/H.323 signaling and RTP media to traverse the firewall by having Expressway-C initiate a persistent outbound connection to Expressway-E (firewall-friendly), which then relays traffic for inbound B2B calls. This differs from MRA, which requires the UC traversal zone (with additional protocol support). A neighbor zone (D) is for peer connections without firewall traversal. A DNS zone (B) routes outbound calls using DNS SRV lookups. The default zone (C) handles unclassified inbound traffic, not the C-to-E link.
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