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Cisco 300-830 CLCCE study materials
Cisco 300-830 CLCCE study resources

Cisco 300-830 CLCCE: Cisco Collaboration Cloud and Edge Solutions

Cisco 300-830 CLCCE · Work through your exam, one topic at a time.

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Cisco Collaboration Cloud and Edge Solutions

Domain 1, Cisco Collaboration Cloud and Edge Solutions, tests whether you can place each Cisco collaboration component in the right architecture and justify the choice. Questions ask you to distinguish on-premises, cloud, and hybrid call control, and to say which node terminates signaling, which relays media, and which one you do not need at all.

The three deployment shapes

  • On-premises Unified CM with an Expressway pair. Unified CM and IM&P sit inside; Expressway-C sits with them or in an internal DMZ, Expressway-E sits in the external DMZ. The pair provides Mobile and Remote Access (MRA) and business-to-business (B2B) calling. CUBE provides PSTN and SIP trunking.
  • UCM Cloud. Cisco hosts a dedicated Unified CM and IM&P as a service. PSTN comes from Cisco Cloud Connected PSTN or from a local CUBE gateway. Edge services for MRA and B2B are part of the cloud service.
  • Webex Calling. Call control, registration, and most media are cloud-native. The Webex App and desk phones register to the Webex cloud, so you do not deploy Expressway for remote users. A local gateway (CUBE) is used only when you need local PSTN breakout or legacy integration.

Who terminates what

  • Expressway-C is the traversal client: it connects outbound to Expressway-E and to the internal call control.
  • Expressway-E is the traversal server in the DMZ: it terminates TLS from external clients and never reaches the internal network directly.
  • CUBE is a SIP back-to-back user agent: it normalizes signaling, applies dial peers, and can encrypt with TLS and SRTP.

Worked example

A customer wants remote Jabber users on UCM Cloud without VPN. The client resolves _collab-edge._tls.<domain> to Expressway-E, opens TLS to it, and signaling traverses the traversal zone to Expressway-C and then to Unified CM. No VPN and no client-visible internal addresses are needed. If the same users were on Webex Calling, the answer would be "no Expressway at all", because the client connects straight to the cloud.

Traps

  • Deploying Expressway for Webex Calling MRA; there is no on-premises call control to traverse to.
  • Swapping the C and E roles, or placing Expressway-E on the internal network.
  • Assuming CUBE is mandatory for every cloud PSTN option; Cloud Connected PSTN does not require it.