voip user guide

XCAL VoIP

Features Edition: 00

Version: 1.00

2009. 03

© Copyright by Couei Corporation Page II

Ⓒ 2005 Couei Corporation., All rights reserved.

This documentation shall not be changed, distributed to the public, and opened to

the third person without written permission. Couei is not responsible for any direct

or indirect damages arisen or related to use of this manual. All information included

herein may be changed without prior notice.

Couei Corporation

Address: 13 F, Queen's Tower A, 2-3-1 Minato Mirai, Nishi-Ku, Yokohama 220-6013,

JAPAN

Phone #: +81-(0)45-682-7000

Fax #: +81-(0)45-682-7007

Web site: http://www.couei.com

http://www.couei.com/

I

Contents

Contents ............................................................................................................................ I

Introduction ..................................................................................................................... 3

Overview ................................................................................................... 3

Key Features .............................................................................................. 5

Measurement Environment ........................................................................... 6

System Requirements .................................................................................. 6

MOS .................................................................................................................................. 7

PESQ ................................................................................................................................. 9

AutoCall Setting ............................................................................................................. 12

VoIP AutoCall Setting ................................................................................ 14

Advance Setting .................................................................................. 17

Result ............................................................................................................................. 19

Call Statistics ........................................................................................... 19

MOS Statistics .......................................................................................... 21

MOS Statistics [All Info tab] .................................................................. 23

RTP Info .................................................................................................. 25

Packet Capture Viewer ............................................................................... 27

PESQ Wave Format ................................................................................... 28

Mobile tab .......................................................................................... 28

All Info............................................................................................... 29

PESQ Information ..................................................................................... 30

MOS Graph .............................................................................................. 33

Measurement result by Count ................................................................ 33

© Copyright by Couei Corporation Page II

Measurement result by Call ................................................................... 33

MOS Signal Graph ..................................................................................... 34

© Copyright by Couei Corporation Page 3

Introduction

Overview

VoIP is an optimization tool which performs VoIP measurement over wireless

network especially for WiMAX network. It monitors changing network environment in

real time as well as measures voice quality, MOS.

Various protocols such as SIP and RTP are utilized to measure voice and its

transferring quality. VoIP performs measurement by unit between WiBro mobile, LCG

(PSTN), and ICG; Mobile to Mobile, Mobile to LCG (PSTN), and Mobile to ICG, which

measures quality between mobile and network node.

VoIP system overview

VoIP Features Chapter 1. Introduction


VoIP main window



Key Features

VoIP optimization tool is provided with the following special features.

To measure VoIP in Softphone type by using SIP Client.

To capture packets in real time and analyze SIP signaling and RTP/RTCP

messages.

To provide various call results through SIP protocol.

To cooperate with various SIP servers. (both free and commercial SIP servers)

To support various codec such as G.711, aLaw/uLaw, GSM, iLBC, G723.1, G729.

To support various audio options such as AEC, VAD, AGC, CNG.

To measure E-model MOS R-Factor (ITU-T G.107) by using packet based media

information.

To measure voice quality (MOS) based on ITU-T PESQ algorithm.

To provide parameters network delay, jitter, packet loss, and etc.

To measure telecommunication quality over WiMAX network by using WiBro

mobile, and provide various parameters.

To monitor various protocols including TCP/IP and SIP in real time.

To measure telecommunication quality between PSTN by cooperating LCG.

To measure telecommunication quality at IP network node by cooperating ICG.

To provide OPTis functionalities.



Measurement Environment

VoIP optimization tool provides various test environments as it performs

measurement by unit between WiBro mobile, LCG (PSTN), and ICG; Mobile to Mobile,

Mobile to LCG (PSTN), and Mobile to ICG, which measures quality between mobile

and network node.

Measurement Environment

System Requirements

Before you begin, ensure that your system meets the following requirements.

Item Requirements

PC Pentium 4 or above

Monitor VGA (Over 1024 * 768, 256 color)

RAM 512MB or above

Hard Drive 10GB or above

Operation System Window 2000/XP/Vista


MOS

This chapter summarizes what MOS (Mean Opinion Score) is and its rating scheme.

MOS provides a numerical measure of the quality of human speech at the

destination end of the circuit. The scheme uses subjective tests (opinionated scores)

that are mathematically averaged to obtain a quantitative indicator of the system

performance.

MOS is based on figures that result from what is perceived by people during tests.

The MOS is generated by averaging the results of a set of standard, subjective test

where a number of listeners rate the heard audio quality of test sentences read

aloud by both male and female speakers over the communications medium being

tested.

MOS value is rated based on the following rating scheme:

Quality level Impairment

5 Excellent

4 Good

VoIP Features Chapter 2. MOS


3 Fair

2 Poor

1 Bad


PESQ

This chapter summarizes PESQ (Perceptual Evaluation of Speech Quality.)

PESQ is an algorithm for automated assessment of the speech quality enjoyed by

the user of a telephony system. It is standardized as ITU-T in 2001, and most

commonly used.

PESQ provides a measure that predicts the result of listening tests on telephony

system. To measure speech quality, it uses a sensory model to compare the original,

unprocessed signal with the degraded version at the output of the communications

system.

The result of comparing the reference and degraded signals is a quality score. This

score is analogous to the subjective MOS measured using panel tests according to

ITU0T P.800.

PESQ takes into account coding distortions, errors, packet loss, delay and variable

delay, and filtering in analogue network components.

VoIP Features Chapter 3. PESQ


Level alignment.

In order to compare the signals, the reference speech signal and the degraded signal

are aligned to the same constant power level. This corresponds to the normal

listening level used in subjective tests.

Input filtering.

PESQ compensates for any filtering that has taken place in the network.

Time alignment.

The system may include a delay, which may change several times during a test - for

example Voice over IP often has variable delay. PESQ can identify and account for

delay changes.

Auditory transform.

In order to compare the reference and degraded signals, taking account of how a

listener would have heard them, each is passed through an auditory transform that

mimics certain key properties of human hearing. This gives a representation in time

and frequency of the perceived loudness of the signal, known as the sensation

surface.

Disturbance processing.

VoIP Features Chapter 3. PESQ


Disturbance parameters are calculated using non-linear averages over specific areas

of the error surface.

Copyright by Couei Corporation Page 12

AutoCall Setting

This chapter enables you to create new scenarios and set AutoCall test for VoIP.

1. Select Manu Bar - File – AutoCall Start, or click on AutoCall icon from

Icon Bar.

2. AutoCall Scenario Setting window appears.

AutoCall Scenario Setting window

3. Click Create New Scenario icon.

4. AutoCall Setup window appears.

VoIP Features Chapter 4. AutoCall Setting


AutoCall Setup window

5. Select VoIP tab.



VoIP AutoCall Setting

Set AutoCall options for VoIP measurement.

VoIP tab in AutoCall Setup window

The detailed options in VoIP tab are as follows.

Item Description

IP Phone Select IP phone type.

* Select SIP call.

Call Type Select call type between origination (sender) or

termination (receiver).

SIP Dial Number

Enter receiver ID or dial number.

Click Advance button for detailed settings. For

detail, see Advance Setting.



Item Description

Mos Calculation Measure MOS while VoIP measurement.

Sound Setting Click Sound Setting button to select Tx/Rx sound

device type and their channel.

Measurement method

Type

Select MOS measurement mode.

Half duplex (Down/Up): Sender and receiver

transfer voice calls alternately.

Full duplex (Down/Up): Sender and receiver

transfer voice calls simultaneously.

Simplex (Down): Sender or receiver receives

voice calls.

Simple (Up): Sender or receiver transmits voice

calls.

ARS Downlink: One-way voice call transferring;

sender or receiver transfers voice call with no

synchronization.

TimeSync (Down/Up): Sender or receiver

transfers voice call based on TimeSync setting.

Measurement method

Algorithm

Select PESQ algorithm between PESQ 862.0 or

PESQ 862.1.

* Select PESQ 862.1.

Measurement method

TimeSync Term(ms)

Enter time sync term for TimeSync type

measurement.

Event

Mos Count for Traffic: Enter MOS count, and

voice call is to be terminated at the MOS count.

Bad Quality Threshold: Enter standard threshold

to determine bad quality threshold. Threshold less

than the value are to be determined as bad quality

threshold.

Continuous B.Q. Threshold: Enter standard

continuous bad quality threshold to determine CBQ

Fail. Threshold which is under CBQ threshold and

appeared more than CBQ count are to be

determined as CBQ Fail.

Continuous B.Q. Count: Enter standard

continuous bad quality count to determine CBQ

Fail. Threshold which is under CBQ threshold and

appeared more than CBQ count are to be

determined as CBQ Fail.

Continuous Call in CBQ: Continue traffic for the

corresponding voice call even if CBQ Fail is

occurred.



Item Description

File

Original File: Select sound source to be received.

Play File: Select sound source to be transmitted.

Plan and wait time (ms): Set waiting time after

ending play sound source. Default value is set to

zero ms.

Wave Save Threshold: Set standard threshold of

wave file to be saved after MOS measurement.

Wave file under the Wave Save Threshold setting

are to be saved.

Save Path: Set save path of wave file. Default

save folder is Logdata folder.



Advance Setting

Advance button in AutoCall Setup window helps to set receiver’s detailed

configuration.

User ID, SIP server address, and etc. registered at free or commercial SIP

server are to be entered.

1. Click Advance button in VoIP tab.

2. VoIP Setting window appears.

VoIP Setting window

The detailed items in VoIP Setting window are as follows.

Item Description

SIP

User Name: Enter user name (ID) or dial number of

SIP server.

Password: Enter password.

SIP Server: Enter SIP server IP address or domain



Item Description

address.

Server Port: Enter port number of SIP server. Generally

port number of SIP server is set to 5060.

STUN Server: Enter STUN server IP address or domain

address. Use when intra IP attempts call communication

with IP outside of company.

Port: Enter port number of STUN server. Use when intra

IP attempts call communication with IP outside of

company.

Outbound: Enter outbound proxy server IP address.

Port: Enter port number of outbound proxy server.

User Domain: Enter user domain if necessary.

Authorization: Show user name.

Dial Number: Enter receiver ID or dial number.

Audio Option

Set voice transferring options while traffic is opened.

These options may affect on MOS measurement.

Acoustic Echo Cancellation (AEC): Remove voice

echo.

Voice Activity Detection (VAD): Close traffic if there

is no call communications.

Automatic Gain Control (AGC): Control sound volume

automatically while call communications.

Comfort Noise Generator (CNG): Generate steady

noise while silence to help stable call communication

conditions.

Audio Set voice codec. Recommended to set one codec.

Show callback

event Display SIP signaling event in Call Statistics window.

Copyright by Couei Corporation. Page 19

Result

This chapter explains network QoS information and MOS result measured by VoIP

calls.

Call Statistics

Call Statistics window shows fail reason and signaling event of SIP as well as general

call statistics.

Call Statistics (Current Scenario) window

The detailed items for Traffic Fail Reason result are as follows.

Item Description

Call

Statistics

VoIP Call

Event

SIP Signaling

Information

VoIP Features Chapter 5. Result


Item Description

Register Fail Registration to SIP server is failed.

Call Fail Wrong receiver ID is entered, receiver is not registered at

server, or receiver is busy status.

Timeout Connecting to traffic is failed within Traffic Setup Time.



MOS Statistics

MOS Statistics window shows MOS statistics and status measured over VoIP calls.

MOS Statistics window

The detailed items in MOS Statistics window are as follows.

Item Description

MOS Type

MOS type

* Simplex (Downlink), Simplex (Uplink), Half Duplex

(Alternation)

Algorithm PESQ algorithm

* MOS P.862, MOS P.862-1

Original file File name of sound source to be received.

Play file File name of sound source to be transmitted.

B.Q. THR Standard threshold to determine bad quality threshold.

Threshold less than the value are to be determined as bad



Item Description

quality threshold.

C.B.Q. THR

Standard continuous bad quality threshold to determine CBQ

Fail. Threshold which is under C.B.Q. THR and appeared more

than C.B.Q. Count are to be determined as CBQ Fail.

C.B.Q. Count

Standard continuous bad quality count to determine CBQ Fail.

Threshold which is under C.B.Q. THR and appeared more than

C.B.Q. count are to be determined as CBQ Fail.

SAVE THR

Standard threshold of wave file to be saved after MOS

measurement. Wave file under the Wave Save Threshold

setting are to be saved.

MOS AVR Average MOS value of the current calls.

Total Call Number of total AutoCalls.

Success (Call) Number of AutoCall success calls.

Mosfail (call) Number of AutoCall fail calls.

GOOD (Call) Good calls determined based on Bad Quality Threshold.

BAD (Call) Bad calls determined based on Bad Quality Threshold.

Total Count Number of total AutoCall count.

Good (Count) Good counts determined based on Bad Quality Threshold.

BAD (Count) Bad counts determined based on Bad Quality Threshold.

C.B.Q. (Count) Number of Continuous Bad Quality determined based on C.B.Q.

THR and C.B.Q. Count.

No MOS Number of counts excluded from MOS measurement.



MOS Statistics [All Info tab]

All Info tab in MOS Statistics window shows overall information of MOS

measurement.

MOS Statistics [All Info] tab

The detailed items in All Info tab in MOS Statistics window are as follows.

Item Description

Total Call Total calls for MOS measurement

MOS Call Type MOS measurement type

Success (Voice) VoIP success calls

Setup Fail VoIP setup fail calls

Traffic Fail VoIP traffic fail calls

DROP VoIP drop calls

Time Time for each section

Success (MOS) MOS success calls

MOS Fail Calls excluded for MOS measurement



Item Description

Good (MOS) MOS calls over Bad Quality Threshold

BAD (MOS) MOS calls under Bad Quality Threshold

NO MOS Number of MOS count under MOS Count for Traffic set

from VoIP tab in AutoCall Setup window.

Aver_Total MOS Average MOS for all calls

Aver_MOS by Call Average MOS for current call

Cur MOS Current MOS value

Status MOS measurement status

MOS 4.0 ~ Number of MOS calls over 4.0

MOS 3.0 ~ 4.0 Number of MOS calls between 3.0 and 4.0




Progress MOS measurement status for one call

MOS Result Current MOS result



RTP Info

RTP Info window shows network QoS information including Delay, Jitter, and Packet

Loss.

RTP Info window

The detailed items in RTP Info window are as follows.

Item Description

Packet Loss (EA) Loss packet count among received packets (Calculated

by Sequence)

RTP Throughput

(kbps) RTP (Real Time Protocol) throughput



Item Description

Delay (ms) Interval between received RTP packets by one second

Delta Delay (ms) Average changes of RTP packet interval

Jitter Delay (ms) Packet delay jitter by one second

One Way Delay (ms) Delay between sender and receiver

RTP Packet Count (EA) Received RTP packet count

Round Trip Time (ms) Returning time of transmitted packet

R-Factor R-Factors based on QoS information including network

delay

R-Factor Mapping MOS MOS in R-Factor relationship



Packet Capture Viewer

Packet Capture Viewer window helps to capture and analyze SIP signaling and

TCP/IP packets in real time.

Packet Capture Viewer window

The detailed items in Packet Capture Viewer window are as follows.

Item Description

Time Time of packet which is currently received

Source Sender’s IP address

Destination Receiver’s IP address

Type Protocol type of received packet

Info Overall information of received packet

Detail Detailed information of received packet



PESQ Wave Format

PESQ Wave Format window compares and analyzes wave formats of original sound

and the sound received in real time.

Mobile tab

Mobile tab in PESQ Wave Format window compares wave format of original

and MOS measured in real time.

Mobile tab in PESQ Wave Format window



All Info

All Info tab in PESQ Wave Format window shows MOS wave format in order

measured from the current call.

All Info tab in PESQ Wave Format window

The detailed items in PESQ Wave Format window are as follows.

Item Description

REF Wave format of reference sound

DATA Wave format of measured sound

E/B Bad frame section

FEC Front End Clip

Sound loss at front section of sound file

HOT Hold Over Time

Sound loss at end section of sound file

D/O Drop Out

Sound loss section

Overlap Overlap measurement and reference sound file to

compare.



PESQ Information

PESQ Information window shows various parameters provided by PESQ excluding

MOS.

PESQ Information window

The detailed items in PESQ Information window are as follows.

Parameter Description

MOS (P.862) The PESQ Score according to P.862 / PESQ




P(P.862)

(P.862)Speech PESQ Score during active speech periods

(mfMOSSpeech in older versions).

(P.862) Noise PESQ Score during silent periods (mfMOSNoise in

older versions).

G.107 Rating The PESQ score mapped as a G.107 (E-Model) Ie

factor.

etc MOS_LQO(862.1) PESQ score mapped to MOS-LQO according to P.862.1

MOS P.800 Obsolete, will be removed in future releases.

Use mfMOSLQO_P862_1 instead.

PESQ Score mapped to the entire P.800 scale (1..5)

Loudness Reference The loudness of the reference signal during speech in

sone

Test The loudness of the degraded signal during speech in

sone

Background Noise The loudness of the degraded signal during silent

intervals in sone

Level Ref Total The Level of the reference file in dB

Speech Active speech level of the reference signal in dBov

Background Noise Level of silent intervals (background noise level) in the

reference signal in dBov

Level Test Total The Level of the degraded file in dB

Speech Active speech level of the degraded signal in dBov

Background Noise Level of silent intervals (background noise level) in the

degraded signal in dBov

Attenuation

& SNR

Attenuation The Level of the reference file in dB

Speech Active speech level of the reference signal in dBov

Silence Level of silent intervals (background noise level) in the

reference signal in dBov

Delay Avg The Level of the degraded file in dB

Min Active speech level of the degraded signal in dBov

Max Level of silent intervals (background noise level) in the

degraded signal in dBov




FEC &

HOT

FEC [1~10] Vector with front end clipping time for each utterance

in ms

HOT [1~10] Vector with hold over time for each utterance in ms

Utterance

Ref.

Ref_Start [1~10] Vector with start time of each utterance of the

reference signal in ms

Ref_End [1~10] Vector with end time of each utterance of the

reference signal in ms

Utterance

Test.

Setence First or Second setence

Clip_Start [1~10] Vector with start time of each utterance of the

degraded aligned signal

Clip_End [1~10] Vector with end time of each utterance of the

degraded aligned signal



MOS Graph

MOS Graph window shows MOS measurement result in bar graph.

Measurement result by Count

MOS Graph (Count) window

Measurement result by Call

MOS Graph (Call) window



MOS Signal Graph

MOS Signal Graph window compares changing RF parameters and MOS value in the

same time frame.

MOS Signal Graph widnow

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