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Collaboration, Voice & AV · Intermediate

Traversal Zone

An Expressway zone that links Expressway-C (client) and Expressway-E (server) through the firewall for signaling and media.

Definition

The traversal client opens and keeps alive an outbound connection to the traversal server, and calls in either direction are then carried through it. Cisco uses Assent or the H.460.18/19 standards for H.323 traversal. A Unified Communications traversal zone type is used specifically for Mobile and Remote Access, while standard traversal zones carry B2B and general calls.

Example

A traversal zone on TCP 7001 carries SIP signaling between Expressway-C and Expressway-E.

Exam tip

Traversal zones need matching credentials, ports and TLS verification settings on both sides.

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