Cisco 300-080 Troubleshooting Cisco IP Telephony and Video Online Training
Cisco 300-080 Online Training
The questions for 300-080 were last updated at Oct 23,2025.
- Exam Code: 300-080
- Exam Name: Troubleshooting Cisco IP Telephony and Video
- Certification Provider: Cisco
- Latest update: Oct 23,2025
After you install the Cisco Jabber client, it fails to register with the Cisco Unified Communications Manager server.
Which two actions can you take to troubleshoot the problem? (Choose two.)
- A . Verify that the DNS SRV record is correctly configured.
- B . Verify that the LMHOST file is installed on the PC.
- C . Verify that the corporate firewall allows connections to and from the Jabber client.
- D . Reboot the Cisco Unified Border Element Gateway.
- E . Verify Layer 3 connectivity on the gateway.
An endpoint has a SIP trunk configured between Cisco Unified Communications Manager (CUCM) and a Cisco VCS cluster. When a call is made from a Cisco TelePresence System EX60 that is registered to the Cisco VCS to a Cisco IP Phone 9971 that is registered to CUCM, it rings. But upon picking up the call, a busy tone is heard.
What should be checked to resolve this issue?
- A . CUCM zone on the Cisco VCS.
- B . SIP trunk and phone region settings.
- C . SIP trunk registration.
- D . authentication on the SIP trunk.
Several users at your site have reported that they receive a fast busy when they call another site within the same cluster.
Which action can you take to connect the problem?
- A . Rebuild the SIP trunk between Cisco Unified Communications Manager and the gateway.
- B . Run RTMT to check the status of the Cisco Unified Communications Manager services.
- C . Reset the intercluster trunk from your site to the remote site.
- D . Correct the grouping of the site partitions and calling search spaces.
Which two items are displayed by checking the VCS via Status > Registration? (Choose two.)
- A . device pool
- B . endpoint name
- C . device type
- D . device description
- E . endpoint MAC address
Users report intermittent call failures. All calls must invoke an IOS-based transcoder, registered to Cisco Unified Communications Manager, to be successful.
Which two commands can be used to rule out issues with the transcoder? (Choose two.)
- A . debug voip ccapi inout
- B . debug ccsip message
- C . show dspfarm profile
- D . show version
- E . debug sccp messages
Refer to the exhibit.
An engineer is troubleshooting an outbound call and needs to see each step of the dial plan as it is being parsed in the system. The engineer is not able to see all of the steps in the trace output.
How can this problem be resolved?
- A . Change the Digit Analysis Complexity to Translation And Alternate Pattern Analysis.
- B . Change the SDL Trace Max File Size to a higher number because it is not large enough to display dial plan steps.
- C . Change the SSL TraceType Flag to 0x9000EC44.
- D . Change the SSL Trace Flush Immediately to True.
An engineer is configuring an IOS MTP on a Cisco 2911 Integrated Services Router and Cisco Unified Communications Manager (CUCM).
dspfarm profile 20 mtp
codec g711ulaw
maximum sessions software 10
associate application SCCP
shutdown
The MTP will not register with CUCM. Based on the configuration, what is the cause of the problem?
- A . The MTP type is not compatible with CUCM.
- B . The dspfarm profile is in a down state.
- C . The MTP type is incorrect.
- D . The MTP is not enabled on CUCM.
Which reason for calls being disconnected just after connection is true?
- A . An incompatible MTP type is allocated to the call.
- B . Codec are mismatched between phones.
- C . Firewall is blocking RTP packets.
- D . Phone A is using SCCP and phone B is using SIP.
Joe is based out of California, USA. He is travelling to London,U.K. for a few days. The ACME Corporation recently deployed Cisco Unified Communications Manager Device Mobility, and both the USA phone (Voice Subnet 10.1.1.0/24) and the London phone (Voice Subnet 10.2.2.0/24) are registered to the same Cisco Unified Communications Manager cluster. The publisher and two subscribers are in California, and the London site has two subscribers. When Joe connects his Cisco IP phone to the London network, the phone displays the message “Device in Home Location.” Assume that call routing, CSS, and partitions are set up in accordance with the country-specific dial plan.
Which statement is true?
- A . To call a U.K. mobile phone, Joe must dial 9 (access code) + 011(international access code in the U.S.) + 44 22 33 44 55 (U.S. dial plan)
- B . Joe is unable to call internal Cisco IP phones in the London office (assuming that CSS and partitions allow the call)
- C . Joe’s Cisco IP phone does not support roaming.
- D . In the UK, the international access code is 00. To call a U.S. number, Joe must dial 9 (access code) + 00 +1 222 333 4567 (U.K. dial plan)
Company XYZ just completed an upgrade of the Cisco Unified Communications Manager from version 9.x to version 10.5. Users report that they cannot log in to Extension Mobility after the upgrade. This error message is displayed “login is unavailable (23)”.
Which action can resolve the issue?
- A . Cisco Unified Communications Manager 10.5 does not include Extension Mobility.
- B . Enable the home cluster option for the affected users.
- C . Re-enable extension mobility for the affected users.
- D . Enable the remote cluster option for the affected users.
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