When a phone is registered over Mobile and Remote Access, where does it register?

The correct answer is B. Cisco Unified Communications Manager. With Cisco Mobile and Remote Access (MRA), the Expressway-E (external edge) and Expressway-C (internal connector) act as a secure traversal proxy. However, the phone's SIP registration is ultimately forwarded through this traversal path to Cisco Unified Communications Manager…

On-Premises Call Control

Question

Options

AExpressway-C
BCisco Unified Communications Manager
CCisco Unified presence server
DExpressway-E

How the community answered

(32 responses)

B
91% (29)
C
3% (1)
D
6% (2)

Explanation

With Cisco Mobile and Remote Access (MRA), the Expressway-E (external edge) and Expressway-C (internal connector) act as a secure traversal proxy. However, the phone's SIP registration is ultimately forwarded through this traversal path to Cisco Unified Communications Manager (CUCM). CUCM remains the registrar and call-control authority. Expressway is not the registration endpoint-it simply provides the secure, firewall-traversal tunnel. This is why remote phones behave exactly like on-premises phones: all features, voicemail, and policies are controlled by CUCM.

Topics

#Mobile and Remote Access (MRA)#Cisco Unified Communications Manager (CUCM)#Endpoint Registration#Collaboration Architecture

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