A company has a Cisco Collaboration Solution with a Cisco UCM for internal and external voice services and Cisco Expressways for video endpoint registration and B2B communications. How can an…

Question

Options

• AUse the call source setting to block any calls from the Default zone toward Cisco UCM.
• BUse the call source setting to block any calls originating from the B2B traversal zone toward Cisco
• CBlock all voice-based services on Expressway-C by removing DSCP 46-based traffic.
• DBlock calls using Search Rules with external prefixes for voice calls.

• A
  14% (4)
• B
  75% (21)
• C
  7% (2)
• D
  4% (1)

Explanation

Cisco Expressway search rules support a 'call source' condition that filters which zone a call originated from. By creating a search rule that blocks (or does not route to UCM) calls whose source is the B2B traversal zone, the engineer ensures that calls arriving from external B2B partners cannot reach UCM. Meanwhile, MRA-registered video endpoints connect through a different zone (the MRA traversal zone or Default zone from the internal side), so their calls are not blocked by this rule and can still be routed to UCM for external voice services. Option A would block all calls from the Default zone, which would break legitimate internal endpoint calls. Option C is incorrect - DSCP markings are QoS mechanisms, not a call-blocking mechanism. Option D using Search Rules with external prefixes would affect all voice calls including those from internal endpoints.

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