350-801 · Question #67
Which call flow matches traffic from a Mobile and Remote Access registered endpoint to central call control?
The correct answer is D. Endpoint > Expressway-E > Expressway-C > Cisco Unified CM. For Mobile and Remote Access (MRA), an endpoint outside the enterprise network connects to Cisco Expressway-E (Edge), which then proxies traffic to Cisco Expressway-C (Core) inside the network, and finally Expressway-C forwards it to Cisco Unified Communications Manager (CUCM)…
Question
Which call flow matches traffic from a Mobile and Remote Access registered endpoint to central call control?
Options
- AEndpoint > Expressway-C > Cisco unified CM
- BEndpoint > Expressway-E > Cisco Unified CM
- CEndpoint > Expressway-C > Expressway-E > Cisco Unified CM
- DEndpoint > Expressway-E > Expressway-C > Cisco Unified CM
How the community answered
(26 responses)- C4% (1)
- D96% (25)
Why each option
For Mobile and Remote Access (MRA), an endpoint outside the enterprise network connects to Cisco Expressway-E (Edge), which then proxies traffic to Cisco Expressway-C (Core) inside the network, and finally Expressway-C forwards it to Cisco Unified Communications Manager (CUCM) for call control.
This flow incorrectly assumes the endpoint directly connects to Expressway-C, which is typically internal, bypassing the necessary Expressway-E for remote access.
This flow is incomplete as it bypasses Expressway-C, which acts as the internal proxy between Expressway-E and CUCM.
This flow reverses the order of Expressway-C and Expressway-E; the external endpoint must connect to the external Expressway-E first.
The correct call flow for an MRA registered endpoint is Endpoint > Expressway-E > Expressway-C > Cisco Unified CM. The endpoint, being external, first connects to the Expressway-E, which is internet-facing, then Expressway-E forwards the traffic securely to Expressway-C in the internal network, and finally, Expressway-C communicates with CUCM for call processing.
Concept tested: MRA call flow architecture
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X14-0/mra/cisco-expressway-mra-deployment-guide-X14-0.html#CiscoExpressway-MRATrafficFlows
Topics
Community Discussion
No community discussion yet for this question.