AudioCodes Media Pack MP-11x Manuale utente

Audiocodes T.38 FAX Configuration Guide

Verizon T.38 FAX Configuration Guide for AudioCodes MP-11x 30-APR-2011

Version 1.0 Page 1 Page 1 of 42

Verizon T.38 FAX Configuration

Guide for AudioCodes MP-11x

Version 1.0

Audiocodes T.38 FAX Configuration Guide

Verizon T.38 FAX Configuration Guide for AudioCodes MP-11x 30-APR-2011

Version 1.0 Page 2 Page 2 of 42

Revision History

Revision

Date

Published

Author

Reason for Revision

0.9

30-APR-2011

David R. Zebley

Draft

1.0

03-MAY-2011

David R. Zebley

Release

Audiocodes is a trademark of AudioCodes Ltd.

Verizon is a trademark of Verizon Trademark Services LLC.

Avaya is a trademark of Avaya Inc.

Windows is a trademark of the Microsoft Corporation.

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Document History

Reviewed By

Organization

Person

Date

Audiocodes

Patrick Kain

03-MAY-2011

Verizon

Bob Boccia

11-MAY-2011

Avaya

Patrick Lafargue

11-MAY-2011

Glossary & Acronyms

Term

Definition

CPE

Customer Premise Equipment

Media Pack

EMS

Element Management System

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Table of Contents

TABLE OF CONTENTS 4

1. PRELIMINARY 5

1.1 APPLICABLE AUDIOCODES SYSTEMS 5

1.2 MANAGEMENT BY WEB 6

1.3 MANAGEMENT BY EMS 7

1.4 AUDIOCODES CONFIGURATION FILE BASICS 7

1.5 DOCUMENT CONVENTIONS 8

1.6 AUDIOCODES SOFTWARE RELEASES 8

1.7 REFERENCES 8

2. FAX CONFIGURATION SETTINGS 10

2.1 SIP GENERAL PARAMETERS 10

2.2 FAX AND MODEM SETTINGS 12

2.3 RELATED SETTINGS 15

2.4 USING PROFILES WITH FAX 15

2.5 ADVANCED FAX SETTINGS 17

2.6 KNOWN CONSTRAINTS 17

3. TROUBLESHOOTING 18

3.1 AUDIOCODES SYSLOG APPLICATION 18

3.2 DEBUG MODE SYSLOGS 20

3.3 DEBUG RECORDING OVERVIEW 21

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1. Preliminary

The primary purpose of this document is a configuration guide to be used by Verizon

Employees and other authorized personnel as an aid in implementing T.38 FAX on the

AudioCodes MP Media Pack Analog Gateway with the Avaya Communication Server

1000 (CS-1K). It is intended to provide a high level view of sample configurations as

well as show as many critical configuration details as practical without duplicating the

existing installation, operation, and configuration documentation. This document may

also be useful to customers or potential customers who are interested in standard

installations involving these components.

This configuration guide provides you with supplementary information on AudioCodes

SIP-based, Voice-over-IP (VoIP) devices specific to Avaya CS-1K deployments. Refer

to the User Manual and other references at the end of this section for a full description of

the capabilities of these products.

1.1 Applicable AudioCodes Systems

Media Pack Series:

AudioCodes Media Pack Series is designated by MP-1xx (for example the 2-line MP-

112, the four line MP-114, or the 24 line MP-124). The MP-1xx is a multi-line analog

Media Gateway which provides excellent voice quality and optimized packet voice

streaming over IP networks, enabling voice, fax, and data traffic to be sent over the same

IP network.

Based on AudioCodes‟ award-winning, field-proven TrunkPack design, the MP-1xx uses

AudioCodes‟ well-established DSP voice compression technology. The MP-1xx

incorporates up to 24 analog ports for connection, either directly to an enterprise PBX

(MP-10x/FXO), and to phones or fax (MP-1xx/FXS), supporting up to 24 simultaneous

VoIP calls. Additionally, the MP-1xx is equipped with a 10/100 Base-T Ethernet port for

connection to the LAN. MP-1xx Gateways are best suited for small to medium-sized

enterprises, branch offices or for residential Media Gateway solutions.

Figure 1 –AudioCodes MP-1xx (MP-118 shown)

AudioCodes EMS

The AudioCodes Element Management System (EMS) is an advanced solution for

standards-based management of Media Gateways within VoP networks, covering all

areas vital for the efficient operation, administration, management and provisioning

(OAM&P) of AudioCodes‟ families of Media Gateways. The EMS features a

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Client/Server architecture, enabling customers to access the EMS from multiple, remotely

located work centers and workstations.

Figure 2 - AudioCodes EMS

1.2 Management by Web

The AudioCodes EMS is commonly used in solutions which involve multiple gateways

or in high availability or high security applications. Each gateway is also equipped with a

configuration and management interface accessible via a standard web browser via HTTP

or HTTPS. The web design of the various digital gateway products in general share a

common web design and the references within this configuration guide are applicable to

any of the deployed products. The web interface provides a simple search capability

which makes it easy to find the various parameters when some or all of the name is

known (for example entering “Alt Routing”).

Figure 3 - Sample Web Configuration screen

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1.3 Management by EMS

The EMS supports a Help menu option which provides a search similar to the Web GUI.

There is a convention used in this document to indicate navigation for menus, sub-menus,

and tab headings (both top of frame or side of frame). The example shown below would

be denoted in bold as follows:

SIP->Routing->Route Modes

Figure 4 - Sample EMS Screen

1.4 AudioCodes Configuration File Basics

In addition to the Web and EMS view, each configuration parameter is part of an ASCII

file known as the initialization file or INI file (a.k.a. the conf file). Most parameters

follow in a simple NAME = VALUE, line by line sequence as shown below:

ALTROUTINGTEL2IPENABLE = 1

In general, the value 0 indicates FALSE or NO and 1 indicates TRUE or YES.

For more complex configuration parameters, the INI file supports tables. Table entries in

the document are indicated by using an underscore notation as shown below:

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SNMPManagerTableIP_2 = 0.0.0.0

SNMPManagerIsUsed_2 = 0

Because the INI file numbering is zero-based, this example shows that the third SNMP

manager in the table has not been enabled.

The INI file can be easily retrieved from the media gateway by either the WEB or EMS.

IMPORTANT NOTE: The INI file only shows a parameter value when it differs from the

default. When a parameter is not found in the INI file, it can be assumed to be at the

default value.

1.5 Document Conventions

In most cases, a screen capture of the referenced parameter will be provided for both the

web GUI and the EMS view. The user should reference the screen which matches the

management mode for the deployment (either Web or EMS). For clarity, each referenced

parameter will first be discussed by referencing the INI file name (for example,

ALTROUTINGTEL2IPENABLE). The reference will be followed by a short definition

which will include a description of valid ranges and default values.

1.6 AudioCodes Software Releases

Each AudioCodes software release will have four numerical indicators, for example

6.2.34.4. The first two numbers indicate the major release. This indicator progresses as

follows: 5.0, 5.2, 5.4, 5.6, 5.8, 6.0, 6.2, etc. The second two indicators represent the

minor release. In general, the minor release indicators are not usually significant to end

users.

The software version can be easily determined from either the web or EMS views. The

software version can be referred to with leading or trailing zeroes which can be ignored.

For example, the web GUI may display a version 06.20.034.004 for the 6.2 version

referenced above. In some cases, a letter designation will be included, as in

6.20A.043.002.

This manual in general is applicable to the 6.0 and 6.2 versions. The screens are captured

from the 6.2 version and may vary slightly from version to version.

1.7 References

The last 3 digits of the document reference number (beginning with LTRT) vary by

release. These digits are replaced by xxx in the table below.

LTRT-59xxx MP-11x and MP-124 SIP Installation Manual Ver. 6.x.pdf

LTRT-65xxx_MP-11x_and_MP-124_SIP_User's_Manual_Ver_6.x.pdf

LTRT-66xxx CPE Configuration Guide for IP Voice Mail Ver 6..x.pdf

LTRT-26xxx SIP CPE Release Notes Ver. 6.x.pdf

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LTRT-29xxx Errata-Addendum for SIP CPE Documentation 6.x.pdf

LTRT-52xxx SIP CPE Product Reference Manual Ver 6.x.pdf

LTRT-94xxx EMS Server Installation, Operation, and Maintenance (IOM) Manual

v6.x.pdf

LTRT-91xxx EMS User's Manual v6.x.pdf

LTRT-90xxx EMS Release Notes v6.x.pdf

A complete set of applicable AudioCodes documentation is shipped by CD/DVD with the

product. Updated versions (as new major releases come out) can be obtained by

registering at www.audiocodes.com in the Support section.

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2. FAX Configuration Settings

Per the requirements of the tested solution, the values shown in this guide are in general

the defaults for the basic T.38 FAX. Because the AudioCodes MGW supports several

alternate ways of transporting FAX and Modem data (Transparent, Transparent with

events, Bypass, NSE, V.152, etc.), there are many settings and combinations of settings

that are best left to solving specific situations. Complete information about these non-

standard values is included in the User‟s manual referenced above.

If you are using the default settings and you are still experiencing problems with T.38

FAX, check first the end to end call flow. In previous releases, most of these FAX issues

result from issues revolve around routing, and or the proper server settings for Avaya

TON/NPI headers.

DO NOT CHANGE FAX SETTINGS THAT ARE NOT WELL UNDERSTOOD in an

effort to fix a specific FAX failure since that will cause an unsupported configuration to

be placed in service with possible support issues down the road.

Additionally, make sure that the software release running on the Audiocodes MP-1xx

matches exactly the approved load line up for the release. Occasionally, the devices

shipped from stock have been manufactured prior to the final release date or have been in

a warehouse for so long that there is a good chance that the version is not correct. IT IS

THE RESPONSIBILITY OF THE INSTALLER to check and verify that the software

placed in service is in accordance with the solution as it was tested for interoperability.

2.1 SIP General Parameters

The values shown are basic T.38 examples. Other than some that are highlighted below,

most of the default values are usually used in the SIP General Parameters.

IsFaxUsed = 1

Fax Signaling Method

In the T.38 Relay Mode, upon detection of a fax signal the terminating device negotiates

T.38 capabilities using a SIP Re-INVITE message. If the far end device doesn't support

T.38, the fax fails. In this mode, the parameter FaxTransportMode is ignored. To

configure T.38 mode using SIP Re-INVITE messages, make the following setting:

[0] No Fax = No fax negotiation using SIP signaling. Fax transport

method is according to the parameter FaxTransportMode (default).

[1] T.38 Relay = Initiates T.38 fax relay.

[2] G.711 Transport = Initiates fax / modem using the coder G.711 Alaw/

μ-law with adaptations (refer to User‟s Manual).

[3] Fax Fallback = Initiates T.38 fax relay. If the T.38 negotiation fails,

the device re-initiates a fax session using the coder G.711 A-law/μ-law

with adaptations (refer to the Note in the User Manual).

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