The following questions test your knowledge of topics explained in this chapter. You can find the answers to the questions in Appendix A, "Answers to Chapter Review Questions."
Which two functions does a gateway provide?
Translation between the VoIP and PSTN network
Physical access for analog telephones and fax machines
Power over Ethernet to the IP phone
Which protocol provides out-of-band control information for RTP-based call flows?
A company has four sites and wants to implement VoIP at all of them. The requirements include implementing gateway devices with no call-processing intelligence at the remote sites, controlling all call traffic from the headquarters location, and having a single point of CAC. Which network architecture is appropriate to meet these requirements?
H.323 gateway architecture
In which of the following situations would a gateway be required?
Cisco CallManager-to-IP network connection
PBX-to-voice mail connection
Key system-to-IP network connection
Which function best describes a numbering plan?
Determines routes between source and destination
Defines a telephone number of a voice endpoint or application
Performs digit manipulation when sending calls to the PSTN
Performs least-cost routing for VoIP calls
Which worldwide prefix scheme was developed by the ITU to standardize numbering plans?
Which three factors must be considered when calculating the total bandwidth of a VoIP call?
Capacity of network links
What is the overhead for Frame Relay?
What is the equivalent of one Erlang?
60 call seconds
36 centum call seconds
3600 centum call seconds
Which feature provides transport security for a VoIP network?