Pearson 350-801 New Attempt

The call flow for a Mobile and Remote Access registered endpoint to central call control is as follows:

• The endpoint registers with the Expressway-C.
• The Expressway-C forwards the registration request to the Expressway-E.
• The Expressway-E forwards the registration request to the Cisco UCM.
• The Cisco UCM registers the endpoint.

When the endpoint places a call, the call flow is as follows:

• The endpoint sends the call request to the Expressway-C.
• The Expressway-C forwards the call request to the Expressway-E.
• The Expressway-E forwards the call request to the Cisco UCM.
• The Cisco UCM places the call.

The Expressway-C and Expressway-E are used to provide secure access to the Cisco UCM for endpoints that are not located on the corporate network. The Expressway-C is located on the corporate network, and the Expressway-E is located in the DMZ.

A hybrid local gateway handles calls between the Public Switched Telephone Network (PSTN) and Webex Calling. It is commonly deployed on the customer's premises but can also be hosted by a partner. The local gateway registers with Webex Calling and handles all calls between the PSTN and Webex Calling. It gives customers the flexibility to bring their own service provider or continue using their existing provider for a smooth and effective transition to the cloud.