An engineer wants to configure third-party video conferencing systems to collaborate with internal CTS endpoints that are registered to Cisco Unified Communications Manager. The third-party…

Cisco TelePresence Management Suite (TMS) is a required management and scheduling layer for CTS endpoints; it coordinates interoperability sessions and provides the call control logic needed for third-party video collaboration.

Expressway with MRA (Mobile Remote Access) is designed for Cisco Jabber and soft clients to register to CUCM from outside the network, not for B2B federation with third-party video conferencing systems.

Expressway-C is the internal-facing traversal component and alone does not provide the internet-facing B2B connectivity this design requires; it must be paired with Expressway-E to function.

The Cisco MXE 3500 is a media encoding and transcoding appliance used for video content preparation and publishing, not a signaling or traversal component for live video collaboration.

Expressway-E is the internet-facing traversal component that enables B2B video federation, allowing third-party endpoints on the public internet to establish calls through the corporate firewall to internal systems.