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Collaboration, Voice & AV · Intermediate

Expressway-C

The internal Expressway node that connects to CUCM and other internal systems and acts as the traversal client to Expressway-E.

Definition

Expressway-C sits on the trusted network, proxies signaling to CUCM, IM and Presence and Unity Connection, and initiates outbound traversal connections to Expressway-E so no inbound firewall pinholes are needed from the DMZ. It can also host local registrations for SIP and H.323 endpoints and perform interworking.

Example

Expressway-C discovers CUCM nodes for MRA and establishes a Unified Communications traversal zone to Expressway-E.

Exam tip

Expressway-C is the traversal client; Expressway-E is the traversal server.

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