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Cisco 800-150 Exam - Topic 2 Question 23 Discussion

Which protocol should be analyzed when troubleshooting call quality between IP phones?
D) RTP
A) SIP
B) SCCP
C) H.323
H) 323: An older protocol suite for multimedia communication, encompassing both signaling and media, but less commonly used in modern IP telephony. Reference: Supporting Cisco Devices for Field Technicians (FLDTEC) -- Troubleshooting Methodologie

Cisco 800-150 Exam - Topic 2 Question 23 Discussion

Actual exam question for Cisco's 800-150 exam
Question #: 23
Topic #: 2
[All 800-150 Questions]

Which protocol should be analyzed when troubleshooting call quality between IP phones?

Show Suggested Answer Hide Answer
Suggested Answer: D

When addressing call quality issues between IP phones, the Real-time Transport Protocol (RTP) is the primary protocol to analyze. RTP is responsible for the actual transmission of voice data during a call, and its performance directly impacts call quality.

Key factors affecting RTP and, consequently, call quality include:

Packet Loss: Missing packets can lead to audio gaps.

Jitter: Variations in packet arrival times can cause choppy audio.

Latency: Delays in packet delivery can result in noticeable lag.

Analyzing RTP streams allows technicians to identify these issues and implement appropriate Quality of Service (QoS) measures to mitigate them.

In contrast:

SIP (Session Initiation Protocol): Handles call setup, modification, and teardown but not the media stream.

SCCP (Skinny Client Control Protocol): A Cisco proprietary protocol for signaling, not media transport.


by Gail at Jul 02, 2026, 03:38 AM

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Lawana
3 days ago
SCCP is less common now, right?
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Rory
8 days ago
RTP is crucial, but SIP is for call setup.
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Rolande
13 days ago
What about RTP? It deals with media streams.
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Clay
18 days ago
I agree, SIP handles signaling well.
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Genevive
24 days ago
I think SIP is the best choice. It's widely used.
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Cassi
29 days ago
Wait, are we sure RTP is the right choice?
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Douglass
1 month ago
H.323? Isn't that pretty outdated now?
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Raina
1 month ago
RTP is key, but SIP handles signaling too.
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Leanora
1 month ago
I thought SIP was the main one for that?
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Hyun
2 months ago
Definitely RTP for call quality issues!
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Chaya
2 months ago
H.323 seems outdated, but I feel like it could still play a role in some scenarios. I need to double-check that!
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Janessa
2 months ago
SCCP was mentioned as a Cisco-specific protocol, but I don't recall it being the primary focus for troubleshooting call quality.
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Hyman
2 months ago
I think RTP is crucial for media transport, so it might be the right answer, but I could be mixing it up with SIP.
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Juliann
2 months ago
I remember we discussed SIP a lot in class, but I'm not entirely sure if it's the main one for call quality issues.
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