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Cisco 300-815 Exam Questions
Implementing Cisco Advanced Call Control and Mobility Services (CLASSM) (Page 4 )

Updated On: 19-Apr-2026
Page 4 of 50
PDF with 245 Questions

Which section under the Real-Time Monitoring Tool allows for reviewing the call flow and signaling for a SIP call in real time?

  1. Analysis Manager > Inventory > Trace File Repositories
  2. System > Tools > Trace and Log Central
  3. Voice/Video > Session Trace Log View > Real Time Data
  4. Voice/Video > Session Trace Log View > Open From Local Disk

Answer(s): C


Reference:

https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications- manager-callmanager/213583-procedure-to-analyse-call-flow-of-sip-ca.html



What is a description of RTP timestamps or sequence numbers?

  1. The sequence number is used to detect losses.
  2. Timestamps increase by the time "carrying" by a packet.
  3. Sequence numbers increase by four for each RTP packet transmitted.
  4. The timestamp is used to place the incoming audio and video packets in the correct timing order (playout delay compensation).

Answer(s): D


Reference:

https://www.cs.columbia.edu/~hgs/rtp/faq.html



A support engineer is troubleshooting a voice network.
When conducting a search for call setup details related to calling search space issues, which trace files should be investigated?

  1. CallManager traces
  2. CTI Manager traces
  3. Cisco IP Manager Assistant
  4. Call logs

Answer(s): A





Refer to the exhibit. A user reports that when they call a specific phone number, no one answers the call, but when they call from a mobile phone, the call is answered. The engineer troubleshooting the issue is expecting the far-end gateway to cut through audio on the 183 Session Progress SIP message.
Which SIP Profile configuration element is necessary for the Cisco Unified Communications Manager to send acknowledgement of provisional responses?

  1. Allow Passthrough of Configured Line Device Caller Information must be enabled.
  2. Accept Audio Codec Preferences in Received Offer must be set to On.
  3. On the SIP Profile, the configuration parameter SIP Rel1XX Options must be set to Send PRACK for all 1xx Messages.
  4. Early Offer for G Clear Calls must be enabled.

Answer(s): C





Refer to the exhibit.
While troubleshooting call failures on the Cisco Unified Border Element, an administrator notices that messages are being sent to the service provide, but there is no response. The administrator later learns that this SIP provider does not support PRACK.
Which header should be removed from the SIP

message to resolve this issue?

  1. Require: 100rel
  2. Content-Type: application/sdp
  3. Contact: <sip:987654321@192.168.100.200:5060>
  4. Content-Disposition: session;handling=required

Answer(s): A



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