350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ263

Voice Gateways and Session Border Controllers

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Refer to the exhibit. You deploy Mobile and Remote Access for Jabber and find that Jabber for Windows does not register with Cisco Unified Communication Manager when it is outside the office.

What causes this issue?

  • A Server 4.2.2.2 is not a valid DNS server.
  • B The DNS record should be created for _cisco-uds._tcp.example.com.
  • C The DNS record should be changed from _collab-edge._tcp.example.com to __collab-edge._tls.example.com.
  • D The DNS record type should be changed from SRV to A.
Explanation

External Mobile and Remote Access service discovery requires a public DNS SRV record named _collab-edge._tls.<domain> that directs clients to Expressway-E on port 8443. A record using _collab-edge._tcp.example.com has the wrong protocol label, so Jabber for Windows cannot discover the MRA service for remote Unified CM registration.

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