Information Technology Reference
In-Depth Information
2.
What is the default coder-decoder (codec) used with VoIP dial peers?
a.
G.711
b.
G.723
c.
G.728
d.
G.729
3.
Real-time Transport Protocol (RTP) operates at what layer of the OSI model?
a.
Application
b.
Session
c.
Tran s por t
d.
Network
4.
Which H.323 protocol is responsible for call setup and signaling?
a.
H.245
b.
G.711
c.
H.225
d.
RTCP
5.
What unit represents the average number of concurrent voice calls, commonly calcu-
lated for the period of 1 hour?
a.
Kbps
b.
Erlang
c.
DS0
d.
FXS
6.
Which feature does not transmit packets when there is silence?
a.
Ear and mouth (E&M)
b.
Vo i c e - a c t i v i t y d e t e c t i o n ( VA D )
c.
Dial peers
d.
Digital silence suppressor (DSS)
7.
What does Compressed Real-time Transport Protocol (cRTP) compress?
a.
RTP headers
b.
RTP, TCP, and IP headers
c.
RTP, User Datagram Protocol (UDP), and IP headers
d.
Real-time Transport Control Protocol (RTCP) headers
