Cisco 400-051 Exam

Refer to the exhibit. The exhibit shows an outgoing SIP 401 response message from Cisco Unified Communications Manager to a SIP VoIP service provider gateway. Which action can the Cisco Unified Communications Manager systems administrator use to change the response to “200 OK”?

  • A. Make sure the gateway IP address of the SIP VoIP service provider is defined correctly in Cisco Unified Communications Manager SIP trunk.
  • B. Enable OPTIONS ping on Cisco Unified Communications Manager SIP trunk.
  • C. Disable OPTIONS ping on Cisco Unified Communications Manager SIP trunk.
  • D. Create an SIP response alias to force outgoing 401 messages to “200 OK”.
  • E. Disable digest authentication on Cisco Unified Communications Manager SIP trunk.
Answer: Option E.
Explanation: 

Because Right now CUCM challenges the identity of a SIP user agent and must configure digest credentials for the application user in CUCM or you have to disable it for stop challenging by CUCM.
Reference: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/security/9_0_1/secugd/CUCM_BK_CCB00C40_00_cucm-security-guide-90/CUCM_BK_CCB00C40_00_cucm-security-guide_chapter_011010.html

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