Session Initiation Protocol (SIP) is used to set up peer-to-remote calls, peer-to-peer calls, and SIP trunk calls. SIP is a signaling protocol widely used for initiating, maintaining, and terminating real-time communication sessions, including voice, video, and messaging applications. It facilitates communication between endpoints, whether they are directly connected or through a SIP trunk. Axis Communications' technical documentation on SIP and VoIP solutions confirms these uses.
Question 2
Which of the following statements are true for H.264? (Choose two)
Options:
A.
The size of an l-frame depends on the preceding P-frame
B.
Increased motion in a scene means increased bit rate
C.
Group of Video (GOV) length is directly affected by the sizes of the I- and P-frames
D.
A P-frame references preceding and succeeding P-frames
E.
Longer GOV length means reduced bit rate
Answer:
B, E
Explanation:
H.264 is a video compression standard that adjusts the bit rate based on the motion in the scene. Increased motion results in a higher bit rate because more data is required to accurately represent the changes between frames. Additionally, a longer Group of Video (GOV) length, which means fewer I-frames and more P-frames in a sequence, reduces the overall bit rate since I-frames are larger and require more data. References can be found in the Axis Communications documentation and technical white papers on H.264 compression.
Question 3
Which three are types of field of view?
Options:
A.
Wide-angle, normal, zoom
B.
Telephoto, wide-angle, normal
C.
Wide-angle, varifocal, normal
D.
Normal, zoom, telephoto
Answer:
B
Explanation:
The three types of field of view are telephoto, wide-angle, and normal. A wide-angle lens provides a broader view, a normal lens offers a standard view comparable to the human eye, and a telephoto lens allows for a narrower field of view with greater magnification. Axis Communications' technical resources detail these field of view options for different camera lenses.