300-815 Exam Questions and Answers | Exam-Dumps (Page: 2)

QUESTION: 6

End users at a new site report being unable to hear the remote party when calling or being called by users at headquarters. Calls to and from the PSTN work as expected. To investigate the SIP signaling to troubleshoot the problem, which field can provide a hint for troubleshooting?

Contact: header of the 200 OK response
Allow: header if the 200 OK response
o= line of SDP content
c= line of SDP content

Answer(s): D

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QUESTION: 7

Why would RTP traffic that is sent from the originating endpoint fail to be received on the far endpoint?

The far end connection data (c=) in the SDP was overwritten by deep packet inspection in the call signaling path.
Cisco Unified Communications Manager invoked media termination point resources.
The RTP traffic is arriving beyond the jitter buffer on the receiving end.
A firewall in the media path is blocking TCP ports 16384-32768.

Answer(s): A

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QUESTION: 8

An administrator is troubleshooting call failures on an H.323 gateway via the CLI. To see signaling for media and call setup, which debug must the Administrator turn on?

debug H.323 messages
debug H.225 asn1
debug H.246 asn 1
debug H.225 media
debug H.323 asn 1

Answer(s): B

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QUESTION: 9

What is first preference condition matched in a SIP-enabled incoming dial peer?

incoming uri
target carrier-id
answer-address
incoming called-number

Answer(s): A

Reference:

https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html#anc8

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QUESTION: 10

Cisco SIP IP telephony is implemented on two floors of your company. Afterward, users report intermittent voice issues in calls established between floors. All calls are established, and sometimes they work well, but sometimes there is one-way audio or no audio. You determine that there is a firewall between the floors, and the administrator reports that it is allowing SIP signaling and UDP ports from 20000 to 22000 bidirectionally. What are two possible solutions? (Choose two.)

Go to the SIP profile assigned to these IP phones in Cisco Unified CM and change the range of media ports to 16384-32767
Ask the firewall administrator to change the ports to TCP.
Ask the firewall administrator to change the range of UDP ports to 16384-32767.
Go to the SIP profile assigned to these IP phones in Cisco Unified CM and change the range of media ports to 20000-22000.
Go to System Parameters in Cisco Unified Communications Manager and change the range of media ports to 20000-22000.

Answer(s): C,D

Reference:

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/port/9_1_1/CUCM_BK_T2CA6EDE_00_tcp-port-usage-guide-91/CUCM_BK_T2CA6EDE_00_tcp-port-usage-guide- 91_chapter_01.html

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Cisco® 300-815 Exam (page: 2) Cisco® Implementing Advanced Call Control and Mobility Services (CLASSM) Updated on: 25-Dec-2025

QUESTION: 6

QUESTION: 7

QUESTION: 8

QUESTION: 9

Reference:

QUESTION: 10

Reference:

Cisco® 300-815 Exam (page: 2)
Cisco® Implementing Advanced Call Control and Mobility Services (CLASSM)
Updated on: 25-Dec-2025