A customer wants to enable existing remote Cisco Jabber users to register their devices to Cisco Unified Communications Manager without using a VPN connection. What should the customer implement in or

Cisco Expressway-E (in the DMZ) and Expressway-C (internal) work together to provide MRA, a secure traversal solution that proxies CUCM SIP registrations for Jabber clients over the internet using TLS on standard HTTPS ports, eliminating the need for VPN.

CUCM IM and Presence XMPP Federation enables inter-company instant messaging between organizations, not remote device registration for employees.

VCS does not support MRA; MRA is a feature exclusive to the Cisco Expressway Series, and 'RMA' is not a valid Cisco remote access feature name.

Jabber Guest enables unauthenticated external users to join video calls via a browser link, not to register full Jabber endpoints to CUCM.

VCS does not support Jabber Guest functionality, and Jabber Guest addresses guest access to meetings rather than authenticated Jabber endpoint registration.