VOIP Slides

Question 1

what are 4 main layer protocalls

Answer 1

TCP

UDP

RTP

Question 2

what are main layer 3 protocols

Answer 2

IP

IPX

DDP-datagram delivery protocol used in AppleTalk

Question 3

what are main layer 2 protocols

Answer 3

ethernet

frame realy

ATM

Question 4

what are the layer 1 protocols

Answer 4

DS1 DS3
SONET

TDM protocols

Question 5

where will you find a class 5 switch

Answer 5

PTSN LOCAL netowrk

Question 6

What is a class 4 switch

Answer 6

PSTN Tandem Switch

Question 7

What is the function of a class 3 switch

Answer 7

Switching Long Distance Calls

Question 8

Where will you find IMT trunks

Answer 8

Between LD (class 3) switches

Question 9

Why were Feature Group D trunks created?

Answer 9

To allow equal access and billing without having to dial a LD access code

Question 10

The three devices required to set up a VoIP call are:

Answer 10

media gateway
media gatwaye controller

signaling proxy

Question 11

A call between a VoIP end point and a traditional PSTN phone requires a handoff between

Answer 11

IP and PTSN

Question 12

Can the media gateway controller reside in any location as long as it has Internet connectivity?

Answer 12

YESSS

Question 13

Does voice over IP switch features reside within the local media gateway?

Answer 13

NOOOO

Question 14

Two common signaling protocols utilized in the VoIP network are ________ and ________.

Answer 14

MegaCo

SIP

Question 15

Switch features reside within the local media gateway.

Answer 15

false

Question 16

A SIP Proxy is used to:

Answer 16

nterpret and step up calls, tear down calls — all signaling functions related to calls.

Question 17

The media gateway controller performs the same functions as a class ________ switch.

Answer 17

5

Question 18

gatewat controller used for

Answer 18

Call setup and teardown •Managing traffic flows between networks •Controlling multiple MGs in the network
The MGC interfaces with MGs, Application Servers and the Signaling Gateway

Question 19

application servers do some of the following

Answer 19

•Billing •Automatic Call Distributor •Voice Mail •Unified Messaging •Other service

Question 20

Media Telephone Adapter/Analog Telephone Adapters perform the following functions

Answer 20

•Conversion of the VoIP packet into an analog voice signal •Generates Dial Tone •A to D and D to A conversion

Question 21

The MTA/ATA talks to the MGC through the MG

Answer 21

Media Telephone Adapter/Analog Telephone Adapters

Question 22

VOIP signaling methods

Answer 22

Peer to Peer: Session Initiation Protocol, H.323 Gives the end point enough smarts to handle the call processing
Master/Slave: Megaco/H.248 and MGCP Requires a central controller for call processing

Question 23

SIP is what layer

Answer 23

layer 7 application

Question 24

how does Megaco work

Answer 24

Megaco/H.248 are master-slave protocols used to talk to the SS-7 network through the Signaling Gateway to talk to the PSTN.

Question 25

what kind of packet flows in VOIP

Answer 25

Real Time Protocol is used to carry real-time traffic across the network
Used for voice and video
RTP organizes packets to ensure the packets arrive in the correct order and at the correct time to be used without error.

Real Time Control Protocol is used in conjunction with RTP to carry network information related to RTP flow for troubleshooting

Question 26

quality of service and tagging

Answer 26

Using priority tags in the Layer 3 IP traffic prioritizes voice traffic in the IP network
Diff-Serv, CoS, QoS and DSCP are all different terms for this tagging.
Without the tag traffic is views as best-effort in the network

Question 27

explain the equipment of VOIP

Answer 27

MEdia Gateway

Media Gateway controller

Singaling proxy

Application server