30 Questions
What is an IP Phone?
A device that resembles a standard phone and allows direct communication via the Internet connection
What is a soft phone?
A software used to make IP telephony from a PC
What is the purpose of a VoIP Adapter?
To connect a standard phone to the Internet
What is the function of an IP Gateway?
To ensure the convergence of PSTN and packet-switched networks
What is the purpose of H.323 protocol?
To allow real-time transmission of voice, data, and video over packet-switched networks
What is the purpose of SIP protocol?
To establish, release, and modify multimedia sessions
What is the main benefit of using VoIP technology?
To merge voice, data, and video networks
What is a major challenge faced by companies when migrating to VoIP?
Knowing how to perform the migration
What is an iPBX solution in the context of VoIP?
A software solution for IP networks
What is the main difference between an iPBX and a traditional PBX?
The type of network used
What is a major advantage of using iPBX software solutions?
They are less expensive and more mature
What is the main function of a PBX system?
To switch calls between enterprise users on local lines
Which organisation standardises the protocols related to RTP?
ITU-T
What is the primary purpose of the RTCP protocol?
To monitor transmission statistics and quality of service
What type of protocol is typically used to transport RTP packets?
UDP
What is the primary function of RTP in Voice over IP?
To transmit media streams
Which working group developed the RTP protocol?
Audio-Video Transport Working Group
In what year was the RTP protocol first published?
1996
What type of standards does H.323 use for audio encoding?
G.711, G.722, G.723, G.728 and G.729
What is the primary purpose of the gatekeeper in H.323?
To authorize connections
What is the minimum bit rate at which H.261 can operate?
40 kbit/s
What type of standard is H.261?
Video compression
What is the primary purpose of H.323 ID?
To identify H.323 customers
What is the last step in the H.323 communication process?
The gatekeeper asks the called terminal for its status
What happens when the status is compatible between the calling and called terminals?
The gatekeeper transmits the IP address of the called terminal to the calling terminal.
What protocol is used by the calling terminal to negotiate with the called terminal?
Communication Control Protocols
How are the flows transmitted after negotiation?
Independently of each other between the terminals
What is the function of the encoder in VoIP?
To generate a constant bit rate stream
What is the function of the packetizer in VoIP?
To encapsulate speech samples into packets
What is the function of the playback buffer in VoIP?
To absorb variations or jitter in delay
Learn about VoIP technology and its benefits in telecommunications, including the convergence of voice, data, and video. Understand how VoIP simplifies work and saves money.
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