350-801 practice questions 21–30

1. Question 21 · 450 in bank

   

   Refer to the exhibit. A customer wants the SIP 200 OK shown to advertise codecs in the following order: ✑ G.729 ✑ G.711u ✑ G.711a ✑ G.723 G.728 -

   

   After correcting the codec preferences, what should the audio payload show in the SIP Traces?

   • Am=audio 0 RTP/AVP 0 8 18 4 15
   • Bm=audio 0 RTP/AVP 4 0 8 18 15
   • Cm=audio 0 RTP/AVP 0 18 8 4 15
   • Dm=audio 0 RTP/AVP 18 0 8 4 15

   Show answer

   Answer: D

   Explanation

   You could probably get thru the test just knowing the payload IDs for G.711u being 0 and G.729 being 18. G.729 = 18 G.711u= 0 G.711a = 8 G.723 = 4 G.728 = 15 https://datatracker.ietf.org/doc/html/rfc3551#page-32

   Source: Adapted from community discussion — Omitted

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2. Question 22 · 450 in bank

   A network administrator with ID0123456789 has determined that a WAN link between two Cisco UCM clusters supports only 1 Mbps of bandwidth for voice traffic. How many calls does this link support if G.711 as the audio codec is used?

   • A12
   • B13
   • C15
   • D16

   Show answer

   Answer: A

   Explanation

   Reference: https://getvoip.com/blog/2013/05/31/voip-codecs-bandwidth-your-call-quality/

   Source: Adapted from community discussion — Piji

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3. Question 23 · 450 in bank

   When a new SIP phone is registered to Cisco Unified Communications Manager, it keeps failing and showing an `unprovisioned` error message in the phone display. Which problem is a possible cause of this issue?

   • AAuto-registration is disabled on the Cisco Unified Communications Manager nodes and the phone device does not have a DN configured.
   • BThe DN assigned to the phone is already in use by another SIP phone.
   • CThe phone cannot download and install the latest firmware.
   • DThe DHCP settings are set incorrectly and the phone does not have an alternate TFTP defined.
   • EThe DN configuration for this phone is shared with an SCCP phone, which is not supported.

   Show answer

   Answer: A

   Explanation

   The correct Answer is A. I tested in my office, and 7821 without configured DN, is displaying "Unprovisioned". Auto-reg is disabled also.

   Source: Adapted from community discussion — virtu

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4. Question 24 · 450 in bank

   

   Refer to the exhibit. In this Cisco UCM setup configured for EARLY OFFER, what is the codec preference line in the initial SIP INVITE SDP?

   • Am=audio 16444 RTP/AVP 9 0 8 18 101
   • Bm=audio 16444 RTP/AVP 0 8 18 101
   • Cm=audio 16444 RTP/AVP 9 18 101
   • Dm=audio 16444 RTP/AVP 18 101

   Show answer

   Answer: D

   Explanation

   D is correct. Since the Max Bitrate is only 40kbps, G722 (rtpmap:9) only goes down to 48kbps and G711 (rtpmap:0 ulaw/8 alaw) is 64kbps leaving only G729 (rtpmap:18).

   Source: Adapted from community discussion — Slushed

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5. Question 25 · 450 in bank

   What is required for Cisco UCM to accept SIP calls with a URI in the format of `sip:2001@cucmpub.cisco.com`?

   • AChange the Destination Address to a Fully Qualified Domain Name on the SIP trunk.
   • BSet the SIPS URI Handling to True in CallManager Service Parameters.
   • CDefine Cluster Fully Qualified Domain Name under Servers in Cisco UCM.
   • DDefine Cluster Fully Qualified Domain Name in Enterprise Parameters.

   Show answer

   Answer: D

   References

   • Cisco documentation

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6. Question 26 · 450 in bank

   Select 2

   An administrator installed a Cisco Unified IP 8831 Conference Phone that is failing to register. Which two actions should be taken to troubleshoot the problem? (Choose two.)

   • AVerify that the switch port of the phone is enabled.
   • BCheck the RJ-65 cable.
   • CVerify that the phone's network can access the option 150 server.
   • DVerify that the RJ-11 cable is plugged into the PC port.
   • EDisable HSRP on the access layer switch.

   Show answer

   Answer: AC

   Explanation

   I think option A is referring to the switch port the phone is connected to. I agree it is worded poorly but I think this is a better answer than assuming RJ-65 is just a typo.

   Source: Adapted from community discussion — CiscoSailor

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7. Question 27 · 450 in bank

   Select 2

   A Cisco UCM administrator wants to enable the Self-Provisioning feature for end users. Which two prerequisites must be met first? (Choose two.)

   • AEnd users must have a primary extension.
   • BEnd users must be associated to a user profile or feature group template that includes a universal line template and universal device template.
   • CEnd users must have a secondary extension.
   • DEnd users must belong to Standard CCM Admin Users group, the Standard CCM End Users group, and the Standard CCM Self-Provisioning group.
   • ECisco Extended Functions service must be running.

   Show answer

   Answer: AB

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmcfg/CUCM_BK_C95ABA82_00_admin-guide-100/ CUCM_BK_C95ABA82_00_admin-guide-100_chapter_01101001.html

   References

   • Cisco documentation

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8. Question 28 · 450 in bank

   An administrator executes the debug isdn q931 command while debugging a failed call. After a test call is placed, the logs return a disconnect cause code of 1. What is the cause of this problem?

   • AThe dialed number is not assigned to an endpoint.
   • BThe destination number rejects the call.
   • CThe destination number is busy.
   • DThe media resource is unavailable.

   Show answer

   Answer: A

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9. Question 29 · 450 in bank

   Where in Cisco UCM are codec negotiations configured for endpoints?

   • Aunder device profiles in device settings
   • Bin in-service parameters
   • Cin enterprise parameters
   • Dunder regions using preference lists

   Show answer

   Answer: D

   Explanation

   The correct answer is D. You choose your Codec Preference List in the Region configuration when creating new relationships between Regions.

   Source: Adapted from community discussion — Slushed

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10. Question 30 · 450 in bank

    An engineer configures a Cisco Unified Border Element and must ensure that the codecs negotiated meet the ITSP requirements. The ITSP supports G.711ulaw and G.729 for audio and H.264 for video. The preferred voice codec is G.711. Which configuration meets this requirement? A.

    

    B.

    

    C.

    

    D.

    

    This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

    Show the answer figure

    Answer:

    Explanation

    Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html

    Source: Adapted from community discussion — Ol_Mykhailiuk

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350-801 practice, question 21. 450 questions available.