VoIP Architecture Introduction

What is an IP Phone?

A device that resembles a standard phone and allows direct communication via the Internet connection (correct)
A server that manages a VoIP network
A software used to make IP telephony from a PC
A device that converts analog signals into digital signals

What is a soft phone?

A device that connects a standard phone to the Internet
A server that manages a VoIP network
A software used to make IP telephony from a PC (correct)
A device that converts analog signals into digital signals

What is the purpose of a VoIP Adapter?

To ensure the convergence of PSTN and packet-switched networks
To make IP telephony from a PC
To manage a VoIP network
To connect a standard phone to the Internet (correct)

What is the function of an IP Gateway?

To ensure the convergence of PSTN and packet-switched networks (C) Signup and view all the answers

What is the purpose of H.323 protocol?

To allow real-time transmission of voice, data, and video over packet-switched networks (A) Signup and view all the answers

What is the purpose of SIP protocol?

To establish, release, and modify multimedia sessions (C) Signup and view all the answers

What is the main benefit of using VoIP technology?

To merge voice, data, and video networks (B) Signup and view all the answers

What is a major challenge faced by companies when migrating to VoIP?

Knowing how to perform the migration (D) Signup and view all the answers

What is an iPBX solution in the context of VoIP?

A software solution for IP networks (C) Signup and view all the answers

What is the main difference between an iPBX and a traditional PBX?

The type of network used (D) Signup and view all the answers

What is a major advantage of using iPBX software solutions?

They are less expensive and more mature (C) Signup and view all the answers

What is the main function of a PBX system?

To switch calls between enterprise users on local lines (A) Signup and view all the answers

Which organisation standardises the protocols related to RTP?

ITU-T (D) Signup and view all the answers

What is the primary purpose of the RTCP protocol?

To monitor transmission statistics and quality of service (B) Signup and view all the answers

What type of protocol is typically used to transport RTP packets?

UDP (C) Signup and view all the answers

What is the primary function of RTP in Voice over IP?

To transmit media streams (C) Signup and view all the answers

Which working group developed the RTP protocol?

Audio-Video Transport Working Group (A) Signup and view all the answers

In what year was the RTP protocol first published?

1996 (C) Signup and view all the answers

What type of standards does H.323 use for audio encoding?

G.711, G.722, G.723, G.728 and G.729 (A) Signup and view all the answers

What is the primary purpose of the gatekeeper in H.323?

To authorize connections (C) Signup and view all the answers

What is the minimum bit rate at which H.261 can operate?

40 kbit/s (B) Signup and view all the answers

What type of standard is H.261?

Video compression (D) Signup and view all the answers

What is the primary purpose of H.323 ID?

To identify H.323 customers (C) Signup and view all the answers

What is the last step in the H.323 communication process?

The gatekeeper asks the called terminal for its status (D) Signup and view all the answers

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. (C) Signup and view all the answers

What protocol is used by the calling terminal to negotiate with the called terminal?

Communication Control Protocols (B) Signup and view all the answers

How are the flows transmitted after negotiation?

Independently of each other between the terminals (C) Signup and view all the answers

What is the function of the encoder in VoIP?

To generate a constant bit rate stream (C) Signup and view all the answers

What is the function of the packetizer in VoIP?

To encapsulate speech samples into packets (A) Signup and view all the answers

What is the function of the playback buffer in VoIP?

To absorb variations or jitter in delay (C) Signup and view all the answers