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Collaboration, Voice & AV · Intermediate

Mobile and Remote Access (MRA)

An Expressway solution that lets Webex App, Jabber and Cisco endpoints use CUCM services from the internet without a VPN.

Definition

MRA clients discover the edge through the public _collab-edge._tls SRV record, authenticate through Expressway-E, and have their HTTPS, SIP, XMPP and media proxied through a Unified Communications traversal zone to CUCM, IM and Presence and Unity Connection. Certificates on Expressway-E must include the right domains in their SAN. Authorization uses CUCM credentials, SSO or OAuth tokens.

Example

A home worker's Cisco 8865 phone registers to CUCM through MRA using the activation code onboarding method.

Exam tip

MRA uses _collab-edge._tls on public DNS and _cisco-uds._tcp on internal DNS; if clients find UDS externally, they skip MRA.

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