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Implementing Cisco Advanced Call Control and Mobility Services (CLASSM) Questions 71–75 (page: 16)

Updated On: 10-Feb-2026



Refer to the exhibit. An administrator is troubleshooting why users are not hearing audio when dialing long distance numbers across their Cisco Unified Border Element. The customer's carrier has a requirement that dialing long distance requires an access code to be entered. Looking at the exhibit, what two actions can be taken to correct signaling? (Choose two.)

  1. Enable PRACK.
  2. Enable Early Offer on the Cisco Unified Border Element.
  3. Enable the supplementary-service media-renegotiate command.
  4. Enable Media Flow Around
  5. Enable Mid-Call Signaling Consumption.

Answer(s): A,B



Which IOS command creates a SIP-enabled dial peer?

  1. voice dial-peer 20 sip
  2. dial-peer voice 20 voip
  3. dial-peer voice 20 pots
  4. dial peer voice 20 sip

Answer(s): B


Reference:

https://www.ciscopress.com/articles/article.asp?p=664148&seqNum=6



A user in location X dials an extension at location Y. The call travels through a QoS-enabled WAN network, but the user experiences choppy or clipped audio.
What is the cause of this issue?

  1. missing Call Admission Control
  2. codec mismatch
  3. ptime mismatch
  4. phone class of service issue

Answer(s): B





Refer to the exhibit. A no-way audio situation was experienced after the calling party on an outbound call placed the call on hold and then resumed from hold.
Which action will resolve the issue?

  1. Assign an MTP to the SIP trunk.
  2. Restart the SIP trunk on Cisco UCM.
  3. Upgrade the Cisco Unified Border Element to 15.2.
  4. Upgrade the Cisco Unified Border Element device.

Answer(s): A



A customer reports that outbound calls from Cisco UCM to Cisco Unified Border Element are not getting early media. During troubleshooting, the customer finds that Cisco UCM is sending a delayed offer SIP INVITE. Cisco Unified Border Element responds with a 183 Session Progress with SDP message. However, the customer finds that Cisco UCM does not respond to the 183 messages.
Which action must the customer perform to resolve the problem?

  1. On Cisco Unified Border Element, configure midcall-signaling passthru.
  2. On Cisco UCM, change the "Early Offer support for voice and video calls" field on the SIP profile that is applied to the SIP trunk to Disabled.
  3. On Cisco Unified Border Element, configure early-offer forced.
  4. On Cisco UCM, change the "SIP Rel1XX Options" field on the SIP profile that is applied to the SIP trunk to Send PRACK if 1xx Contains SDP.

Answer(s): D



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