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Transcript of VoIP_UserGuide_Couei
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
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
© Copyright by Couei Corporation Page 4
VoIP main window
VoIP Features Chapter 1. Introduction
© Copyright by Couei Corporation Page 5
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.
VoIP Features Chapter 1. Introduction
© Copyright by Couei Corporation Page 6
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
© Copyright by Couei Corporation Page 7
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
© Copyright by Couei Corporation Page 8
3 Fair
2 Poor
1 Bad
© Copyright by Couei Corporation Page 9
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
© Copyright by Couei Corporation Page 10
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
© Copyright by Couei Corporation Page 11
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
© Copyright by Couei Corporation Page 13
AutoCall Setup window
5. Select VoIP tab.
VoIP Features Chapter 4. AutoCall Setting
© Copyright by Couei Corporation Page 14
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.
VoIP Features Chapter 4. AutoCall Setting
© Copyright by Couei Corporation Page 15
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.
VoIP Features Chapter 4. AutoCall Setting
© Copyright by Couei Corporation Page 16
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.
VoIP Features Chapter 4. AutoCall Setting
© Copyright by Couei Corporation Page 17
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
VoIP Features Chapter 4. AutoCall Setting
© Copyright by Couei Corporation Page 18
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
© Copyright by Couei Corporation Page 20
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.
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 21
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 22
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.
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 23
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 24
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
MOS 2.0 ~ 3.0 Number of MOS calls between 2.0 and 3.0
MOS 1.0 ~ 2.0 Number of MOS calls between 1.0 and 2.0
MOS 0.0 ~ 1.0 Number of MOS calls between 0.0 and 1.0
Progress MOS measurement status for one call
MOS Result Current MOS result
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 25
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 26
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 27
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 28
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 29
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.
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 30
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 31
Parameter Description
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 32
Parameter Description
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 33
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
VoIP Features Chapter 5. Result
© Copyright by Couei Corporation Page 34
MOS Signal Graph
MOS Signal Graph window compares changing RF parameters and MOS value in the
same time frame.
MOS Signal Graph widnow