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Updated: Jun 12, 2026
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Cisco Voice Over IP Sample Questions:
1. In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if cRTP is deployed without redundancy checks?
A) 3 bytes
B) 40 bytes
C) 20 bytes
D) 4 bytes
E) 1 byte
F) 2 bytes
2. LAB
Examine the following PBX system parameters:
The calling side seizes the line by going off-hook on its E-lead and sends information as DTMF digits.
The voice path is 4-wires, and the voice enabled router is in another building from the PBX.
Select the correct set of commands to allow communication between a voice enabled router and a PBX.
A) voice port 1/0/0 signal wink-start operation 4-wire type 3
B) voice port 1/0/0 signal immediate-start operation 4-wire type 2
C) voice-port 1/0/0 signal delay-dial operation 4-wire type 1
D) voice port 1/0/0 signal immediate-start operation 4-wire type 4
3. Refer to the exhibit.
Lighthorse Equine Management would like to investigate converging voice and data on their existing T1 Frame Relay WAN link between New York and Atlanta. Currently the following list of applications are consuming no more bandwidth than what is listed on this segment of the network.
T1 link 1536 kbps
e-mail 75 kbps
internet 200 kbps
Oracle 500 kbps
FTP 250 kbps
Total 1025 kbps
The customer has allocated 25% of the WAN link for routing updates and other overhead. They would like to increase the number of samples encapsulated in each PDU to 40 ms. You have calculated 6 bytes of overhead for Frame Relay, no cRTP, and the use of the
G.711 codec.
How many simultaneous calls could be placed on this link?
A) no more than 20 calls
B) 0 calls
C) 1 call
D) no more than 5 calls
E) 2 calls
F) no more than 10 calls
4. What is the function of a SIP registrar server?
A) acquires endpoint addresses
B) resolves text addresses to IP addresses
C) routes service requests
D) resolves active endpoint addresses
5. How is CAS different on E1 and T1?
A) T1 uses the D channel for CAS signaling.
B) E1 CAS signaling is out-of-band while T1 is in-band.
C) E1 uses robbed-bit signaling.
D) T1 has more signaling channels.
Solutions:
| Question # 1 Answer: F | Question # 2 Answer: B | Question # 3 Answer: C | Question # 4 Answer: A | Question # 5 Answer: B |
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