AudioCodes MP-20 Series Instruction Manual

AudioCodes™
MP-20x Telephone Adapter
Frequently Asked Questions (FAQs)

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Table of Contents
Introduction................................................................................................................6
Frequently Asked Questions ....................................................................................7
Web Access ......................................................................................................................7
Q1:How must I configure my PC in order to connect to the MP-20x Web interface? .....7
Q2:Why can’t I access MP-20x Web interface when my PC is connected to the LAN?.7
Q3:Why can’t I access the MP-20x Web interface while connected to the WAN? .........8
Q4:Why can’t I ping MP-20x?..........................................................................................8
Q5:How do I ping/trace route from MP-20x to other devices in the network?.................8
Q6:Can I use different types of Internet connections such as L2TP, PPTP, and
PPPoE? .....................................................................................................................9
Default Configuration.......................................................................................................10
Q1:How do I restore MP-20x to factory default settings?..............................................10
SIP Configurations ..........................................................................................................11
Q1:Which SIP parameters do I have to configure for MP-20x? ....................................11
VoIP Troubleshooting......................................................................................................12
Q1:How do I troubleshoot SIP calls?.............................................................................12
Q2:Why do I hear a fast busy tone after I pick up the phone (even though all SIP
parameters have been configured)?........................................................................13
Q3:Why do I hear a fast busy tone when making outgoing calls (even though SIP
parameters have been configured)?........................................................................14
Q4:How do I troubleshoot voice echo? .........................................................................14
Regional Settings ............................................................................................................15
Q1:The ring back tone and busy tone are unfamiliar. How can I adjust my call
progress tone?.........................................................................................................15
Bandwidth........................................................................................................................16
Q1:How can I reduce bandwidth utilization for calls from MP-20x?..............................16
Q2:How can I improve voice quality when using Emule/BitTorrent on a PC behind
MP-20x? ..................................................................................................................17
Functionalities .................................................................................................................18
Q1:Does MP-20x support special services such as call forwarding, conference calls,
and do-not-disturb?..................................................................................................18
Q2:What types of fax transport methods are supported by MP-20x? ...........................19
Q3:How do I make a three-way conference call (using Flash Hook Only)?..................20
Q4:Does MP-20x support SIP proxy redundancy? .......................................................20
Q5:Can MP-20x operate behind a NAT? ......................................................................21
Q6:What is the maximum number of phones that can be connected in parallel to a
single MP-20x FXS port?.........................................................................................21
Q7:Can I set up my service so that my caller ID on outbound calls is blocked by
default for all calls, without having to dial additional digits? ....................................21
Software Upgrade ...........................................................................................................22
Q1:How do I upgrade the MP-20x software? ................................................................22
Q2:How can I automatically upgrade one or more MP-20x devices? ...........................23
Telnet and Advanced Configuration ................................................................................ 24
Q1:Can I manage MP-20x from the Telnet? .................................................................24
Q2:How can I hide the configuration file in the Web? ...................................................24
Q3:Why doesn’t MP-20x upgrade from a file in the HTTP server after it is retrieved? .25
Q4:When is the configuration file retrieved from the HTTP server? .............................25
Q5:How do I open a TR-069 license? ...........................................................................25

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List of Figures
Figure 1: MP-20x IP Address Pool Allocated to LAN Hosts................................................................... 7
Figure 2: Enabling Remote Administration (WAN) in the Remote Administration Screen..................... 8
Figure 3: Selecting Internet Connection Type in the Web Interface ...................................................... 9
Figure 4: Restoring Factory Defaults in the Restore Defaults Screen ................................................. 10
Figure 5: Restoring Defaults using Telnet ............................................................................................ 10
Figure 6: Defining Log Level using Telnet............................................................................................ 12
Figure 7: Viewing System Logs in the Web Interface .......................................................................... 12
Figure 8: Verifying SIP User Registration in the Web Interface ........................................................... 13
Figure 9: Verifying SIP Proxy User Name and Password in the Web Interface................................... 13
Figure 10: Configuring Proxy’s Domain Name in the Web Interface ................................................... 14
Figure 11: Selecting Regional Location in the Web Interface .............................................................. 15
Figure 12: Selecting Codecs in the Web Interface ............................................................................... 16
Figure 13: Editing Traffic Shaping in the Web Interface....................................................................... 17
Figure 14: Configuring Supplementary Services in the Web Interface ................................................ 18
Figure 15: Configuring Transparent Fax Transport Method................................................................. 19
Figure 16: Configuring T.38 Fax Transport Method ............................................................................. 19
Figure 17: Configuring Voice Band Data Fax Transport Method ......................................................... 19
Figure 18: Configuring Bypass Fax Transport Method ........................................................................ 19
Figure 19: Configuring SIP Proxy Redundancy in the Web Interface .................................................. 20
Figure 20: Configuring NAT in the Web Interface ................................................................................ 21
Figure 21: Blocking Caller ID in the Web Interface .............................................................................. 21
Figure 22: Upgrading MP-20x using the Web Interface ....................................................................... 22
Figure 23: Automatically Upgrading MP-20x using the Web Interface ................................................ 23
Figure 24: Connecting to LAN Interface using Telnet .......................................................................... 24
Figure 25: Enabling Access to MP-20x from the WAN ........................................................................ 24

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Notice
This document provides Frequently Asked Questions (FAQ’s) for AudioCodes MP-20x
Telephone Adapter.
Information contained in this document is believed to be accurate and reliable at the time of
printing. However, due to ongoing product improvements and revisions, AudioCodes cannot
guarantee the accuracy of printed material after the Date Published nor can it accept
responsibility for errors or omissions. Updates to this document and other documents can be
viewed by registered customers at http://www.audiocodes.com/downloads.
© Copyright 2009 AudioCodes Ltd. All rights reserved.
This document is subject to change without notice.
Document #: LTRT-32301
Date Published: February-18-2009
Trademarks
AC logo, Ardito, AudioCoded, AudioCodes, AudioCodes logo, CTI², CTI Squared, InTouch, IPmedia,
Mediant, MediaPack, MP-MLQ, NetCoder, Netrake, Nuera, Open Solutions Network, OSN, Stretto,
3GX, TrunkPack, VoicePacketizer, VoIPerfect, What's Inside Matters, Your Gateway To VoIP, are
trademarks or registered trademarks of AudioCodes Limited.
All other products or trademarks are the property of their respective owners.
WEEE EU Directive
Pursuant to the WEEE EU Directive, electronic and electrical waste must not be disposed of with
unsorted waste. Please contact your local recycling authority for disposal of this product.
Customer Support
Customer technical support and service are provided by AudioCodes’ Distributors, Partners, and
Resellers from whom the product was purchased. For Customer support for products purchased
directly from AudioCodes, contact [e-mail].

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Introduction
This document provides answers to frequently asked questions (FAQs) about AudioCodes MP-20x
analog telephone adapter. These FAQs are grouped under the following topics:
Web access
Default configuration
Session Initiation Protocol (SIP) configuration
Voice-over-IP (VoIP) troubleshooting
Regional settings
Bandwidth
Functionalities
Software upgrade
Telnet/advanced configuration
For further information regarding MP-20x, you can refer to the following Web URL:
http://www.audiocodes.com/products/mediapack-20x.
If you have any questions that are not addressed in this document, please contact AudioCodes
Customer Support for further assistance.

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Frequently Asked Questions
Web Access
Q1: How must I configure my PC in order to connect to the MP-20x Web interface?
A: For an explanation on configuring your PC for connection to MP-20x Web interface, refer to
Section “Configuring Network Parameters” in LTRT-52702 MP-20x FXS Telephone Adapter
Quick Installation Guide.
Q2: Why can’t I access MP-20x Web interface when my PC is connected to the LAN?
A: Access problems to MP-20x Web interface from the LAN may be caused by one of the
following:
Your PC is not connected to the LAN - verify that your PC is physically connected to the
LAN and not to the WAN.
The IP address (URL) that you enter in your Web browser is incorrect (the MP-20x default
LAN IP address is 192.168.2.1).
The Web interface’s login name and password are incorrect (the default login user name
and password is “admin”).
By default, MP-20x allocates IP addresses to the LAN (i.e., DHCP server) with the IP
address range of 192.168.2.2 to 192.168.2.254. The ‘IP Address Distribution’ screen
allows you define the MP-20x DHCP server IP address pool, as shown below:
Figure 1: MP-20x IP Address Pool Allocated to LAN Hosts
Any connected PC can behave as a DHCP client or with a static IP address within the
range defined above.
Two PCs cannot use the same IP address for 60 minutes or less, even if the first PC was
disconnected. Each IP address within the distribution range is held for a maximum of 60
minutes if used before.

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Q3: Why can’t I access the MP-20x Web interface while connected to the WAN?
A: By default, access to the Web interface from the WAN is disabled.
¾To enable access from the WAN:
1. Logon to the Web interface from the LAN.
2. Access the ‘Remote Administration’ screen (Advanced menu > Remote Administration
icon).
3. Under the Allow Incoming Access to the Web-Management group, select the Using
Primary HTTP Port check box to enable remote connection, as shown below:
Figure 2: Enabling Remote Administration (WAN) in the Remote Administration Screen
Q4: Why can’t I ping MP-20x?
A: By default, the parameter Allow Incoming ICMP Echo Requests is disabled (in the ‘Remote
Administration’ screen - see figure Figure 2). Therefore, to successfully ping MP-20x, enable
this parameter by selecting this check box.
Q5: How do I ping/trace route from MP-20x to other devices in the network?
A: To ping/trace from MP-20x to other devices in the network, refer to LTRT-50606 MP-20x
Telephone Adapter User's Manual Ver. 2.6.2, Section 13.6, “Diagnostics”.

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Q6: Can I use different types of Internet connections such as L2TP, PPTP, and PPPoE?
A: Yes.
¾To change the Internet connection type:
1. Logon to the Web interface from the LAN.
2. Access the ‘Quick Setup’ screen (Quick Setup menu).
3. From the ‘Connection Type’ drop-down list, select the required Internet connection type.
Figure 3: Selecting Internet Connection Type in the Web Interface

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Default Configuration
Q1: How do I restore MP-20x to factory default settings?
A: You can restore MP-20x to default settings using one of the following methods:
Web interface:
a) Logon to the Web interface.
b) Access the ‘Restore Defaults’ screen (Advanced menu > Restore Defaults icon).
c) Click OK.
Figure 4: Restoring Factory Defaults in the Restore Defaults Screen
Telnet:
a) Telnet MP-20x from the LAN.
b) At the CLI prompt, run the following command:
restore_defaults
Figure 5: Restoring Defaults using Telnet
Hardware Reset button: The Reset button is located on the rear panel of MP-20x.
a) Disconnect MP-20x from power.
b) Using a sharp pointed object (such as a pin), press the button and at the same time,
re-connect power to MP-20x.
For additional information, refer to LTRT-50606 MP-20x Telephone Adapter User's Manual
Ver. 2.6.2, Section 13.5, “Restoring Default Settings”.

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SIP Configurations
Q1: Which SIP parameters do I have to configure for MP-20x?
A: For configuring SIP parameters for MP-20x, refer to the following documents:
LTRT-52702 MP-20x FXS Telephone Adapter Quick Installation Guide, Section
“Configuring VoIP Parameters”
LTRT-50606 MP-20x Telephone Adapter User's Manual Ver. 2.6.2, Chapter 5,
“Configuring VoIP Parameters” (providing a detailed description)

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VoIP Troubleshooting
Q1: How do I troubleshoot SIP calls?
A: ¾To troubleshoot SIP calls:
1. Telnet MP-20x from the LAN.
2. Run the following command:
voip_set_log_level 1
Figure 6: Defining Log Level using Telnet
3. Logon to the Web interface.
4. Access the ‘System Monitoring’ screen (System Monitoring menu), and then select the
System Log tab:
Figure 7: Viewing System Logs in the Web Interface
Alternatively, you can monitor the WAN connection with a network sniffer such as Wireshark.
For additional information, refer to LTRT-58201 MP-20x Debugging and Diagnostic Tools
Application Note Ver. 2.6.1, Sections 2.1 and 2.2, and Chapter 4 “SIP Logs”.

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Q2: Why do I hear a fast busy tone after I pick up the phone (even though all SIP parameters
have been configured)?
A: The fast busy tone heard after the phone is off-hooked may be caused by the following:
The SIP user is not registered. To check if your user is registered, perform the following:
a) Logon to the Web interface.
b) Access the ‘System Monitoring’ screen (System Monitoring menu), and then select
the Voice Over IP tab.
Figure 8: Verifying SIP User Registration in the Web Interface
The line’s SIP Proxy user name and password is incorrect. To check this, perform the
following:
a) Logon to the Web interface.
b) Access the ‘Voice Over IP’ screen (Voice Over IP menu), and then select the Line
Settings tab.
c) Edit the required line.
Figure 9: Verifying SIP Proxy User Name and Password in the Web Interface

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Q3: Why do I hear a fast busy tone when making outgoing calls (even though SIP
parameters have been configured)?
A: The fast busy tone may be caused by the Proxy server not been configured with a domain
name:
¾To configure the Proxy with a domain name:
1. Logon to the Web interface.
2. Access the ‘Voice Over IP’ screen (Voice Over IP menu), and then select the Signaling
Protocol tab.
3. Under Signaling Protocol group, in the Gateway Name – User Domain field, enter the
Proxy’s domain name.
Figure 10: Configuring Proxy’s Domain Name in the Web Interface
Q4: How do I troubleshoot voice echo?
A: If you hear the echo, then the echo is caused from one of the following sources:
9Your own handset: try replacing the handset with a new one.
9The remote party: notify this to the far-end for it to resolve this issue.
If the echo is heard by the remote party, ensure that echo cancellation is activated in
MP-20x:
a) Logon to the Web interface.
b) Access the ‘Voice Over IP’ screen (Voice Over IP menu), and then select the Voice
and Fax tab.
c) Under the Echo Cancellation group, select the ‘Enable Echo Cancellation’ check box.

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Regional Settings
Q1: The ring back tone and busy tone are unfamiliar. How can I adjust my call progress
tone?
A: To suite your call progress tones to your geographical location, perform the following:
1. Logon to the Web interface.
2. Access the ‘Regional Settings’ screen (Advanced menu > Regional Settings icon).
3. Select your location for regional settings.
Figure 11: Selecting Regional Location in the Web Interface
For additional information, refer to LTRT-50606 MP-20x Telephone Adapter User's Manual
Ver. 2.6.2, Section 13.8, “Regional Settings”.

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Bandwidth
Q1: How can I reduce bandwidth utilization for calls from MP-20x?
A: It is recommended to use the coder G.729 to reduce bandwidth utilization to the minimum.
¾To select a lower bit-rate codec:
1. Logon to the Web interface.
2. Access the ‘Voice Over IP’ screen (Voice Over IP menu), and then select the Media
Streaming tab.
3. Under the Codecs group, select the required codecs.
Figure 12: Selecting Codecs in the Web Interface

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Q2: How can I improve voice quality when using Emule/BitTorrent on a PC behind MP-20x?
A: You must configure MP-20x to prioritize voice packets over data packets.
1. Logon to the Web interface.
2. Open the ‘Traffic Shaping’ screen (QoS menu > Traffic Shaping tab).
3. In the Tx Bandwidth field, enter the upload speed.
4. In the Rx Bandwidth field, enter the download speed.
5. Select the ‘Enable Dynamic Traffic Shaping’ check box, and then in the Tx Bandwidth
During VoIP Call field, enter the value for upload rate for data bandwidth during a voice
call (original upload data rate - Codec bandwidth and header size).
Figure 13: Editing Traffic Shaping in the Web Interface
For additional information, refer to LTRT-50606 MP-20x Telephone Adapter User's Manual
Ver. 2.6.2, Section 8.1 “Traffic Shaping”.
Note: If you are still experiencing choppy or delayed audio, place your MP-20x directly behind
the broadband Internet modem.

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Functionalities
Q1: Does MP-20x support special services such as call forwarding, conference calls, and
do-not-disturb?
A: Yes, MP-20x supports the following supplementary services:
Call waiting
Call forwarding
Do-not-disturb
Three-way conferencing
Message waiting indication (MWI)
Stutter tone
These services are configured in the Web interface’s ‘Services’ screen (Voice Over IP menu >
Services tab).
Figure 14: Configuring Supplementary Services in the Web Interface
For additional information, refer to LTRT-50606 MP-20x Telephone Adapter User's Manual
Ver. 2.6.2, Section 5.5, “Configuring Services Parameters”.

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Q2: What types of fax transport methods are supported by MP-20x?
A: MP-20x supports the following fax transport types:
Transparent
T.38
Voice-Band Data
Bypass
The fax transport method is configured in the Web interface’s ‘Voice and Fax’ screen (Voice
Over IP menu > Voice and Fax tab).
Figure 15: Configuring Transparent Fax Transport Method
Figure 16: Configuring T.38 Fax Transport Method
Figure 17: Configuring Voice Band Data Fax Transport Method
Figure 18: Configuring Bypass Fax Transport Method
For additional information, refer to LTRT-50606 MP-20x Telephone Adapter User's Manual
Ver. 2.6.2, Section 5.4, “Configuring Voice & Fax Parameters”.

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Q3: How do I make a three-way conference call (using Flash Hook Only)?
A: ¾To make a 3-way conference call:
1. Make a call to A, and then press the flash hook button.
2. Make a call to B, and then press the flash hook button again.
Flash Hook Only is configured in the Web interface’s ‘Dialing’ screen (Voice Over IP menu >
Dialing tab. Under the Key Sequence group, configure the flash hook sequence method.
Q4: Does MP-20x support SIP proxy redundancy?
A: Yes.
¾To configure SIP proxy redundancy:
1. Logon to the Web interface.
2. Open the ‘Signaling Protocol’ screen (Voice Over IP menu > Signaling Protocol tab).
3. Under the SIP Proxy and Registrar group, select the ‘Use Redundant Proxy’ check box,
and then configure the redundant proxy parameters.
Figure 19: Configuring SIP Proxy Redundancy in the Web Interface
For additional information, refer to LTRT-58301 MP-20x Redundant Proxy Application Note
Ver. 2.6.2.