Which feature is enabled by Cisco Mobile and Remote Access?

While internal SIP clients can call external companies, MRA specifically addresses clients *outside* the network needing to connect *into* the UCM for call control and does not enable internal clients to make external calls.

Cisco Mobile and Remote Access (MRA) allows collaboration endpoints, such as Cisco Jabber clients located outside the enterprise network, to securely register to Cisco Unified Communications Manager (CUCM) and access call control features over the internet without the need for a traditional VPN client.

MRA is designed to provide VPN-less access to CUCM; while it uses secure connections (TLS), it specifically *removes* the need for a separate VPN client for Jabber registration and call control.

Cisco Mobile and Remote Access focuses on UCM for call control and client registration, not on providing VPN connectivity between Cisco UCC Express and UCC Enterprise components, which are distinct solutions.