vpacket 5100 Series User manual

Series 5100/6100™
Voice/Data Router
Reference Manual
MGCP Telephony

Trademarks and copyrights
All trademarks and registered trademarks listed belong to their respective owners.
Vpacket, Vpacket Communications, and the Vpacket 5100/6100 Series Voice/Data Router are registered trademarks of Vpacket
Communications, Inc., Milpitas, California.
Vpacket Communications, Inc. does not warrant that the hardware will work properly in all environments and applications, and makes no
warranty and representation, either implied or expressed, with respect to the quality, performance, merchantability, or fitness for a particular
purpose.
The products and programs described in this document are licensed products of Vpacket Communications, Inc. This document contains
proprietary information protected by copyright, and this document and all accompanying hardware, software, and documentation are
copyrighted. Vpacket Communications, Inc. has made every effort to ensure that this manual is accurate. However, information in this guide is
subject to change without notice and does not represent a commitment on the part of Vpacket Communications, Inc. Vpacket Communications,
Inc. makes no commitment to update or keep current the information in this document, and reserves the right to make changes to this manual
and/or product without notice. Vpacket Communications, Inc. assumes no responsibility for any inaccuracies and omissions that may be
contained in this document. If you find information in this document that is incorrect, misleading, or incomplete, we would appreciate your
comments and suggestions.
No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying,
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permission of Vpacket Communications, Inc.
Copyright © 2000-2002 by Vpacket Communications, Inc.™ U.S. Patents Pending. All Rights Reserved. Reproduction or media conversion by
any means is protected by copyright and may only occur with prior written permission of Vpacket Communications, Inc.
The PSQM technology included in this product is protected by copyright and by European, US, and other patents, and is provided under license
from OPTICOM Dipl. Ing. M. Keyhl GmbH, Erlangen, Germany, 2001
1390 McCarthy Boulevard
Milpitas, CA 95035
Tel: 1(866)VPACKET (872-2538)
Fax: [phone]
E-mail: [e-mail]
Web: http://www.vpacket.com
Document title Date
issued Product number Release
Vpacket Series 5100/6100 Voice/Data Router Reference Manual MGCP
Configuration
June 2002 750-0031-001, Rev A 2.1.1
Vpacket 5100/6100 Series Voice/Data Router Reference Manual
(Data Features)
750-0025-001, Rev A
Vpacket 5100/6100 Series Voice/Data Router SIP Telephony Configuration 750-0032-001, Rev A
Vpacket 5100/6100 Series Voice/Data Router H.323 Telephony Configuration 750-0033-001, Rev A
Vpacket 5100/6100 Series Voice/Data Router Web Interface Manual 750-0035-001, Rev A

About this manual

About this manual
ii Vpacket 5100/6100 Series MGCP Telephony

Content summary
Vpacket 5100/6100 Series MGCP Telephony iii
Audience
This manual is written for the technical staff of a service provider, who are responsible for the
telephony configuration of a Vpacket 5100/6100 Voice/Data Router (VDR). These users include,
but are not limited to, network technicians, systems administrators, and network operation staff.
Content summary
This manual contains all of the information you need to configure a 5100/6100 VDR to operate
within an MGCP environment. Table 1 lists the chapters and appendixes and a summary of each.
Table 1. Chapter summaries
Location Contents
Chapter 1 About MGCP Describes MGCP
Chapter 2 Coding profile
commands
Explains the coding profile commands and gives CLI examples
Chapter 3 TCID commands Explains the TCID commands and gives CLI examples
Chapter 4 MGCP commands Explains the MGCP-related commands and gives CLI examples
Chapter 5 T1 interface
commands
Explains the T1 interface commands
Chapter 6 Voice quality
commands
Explains the voice quality commands
Chapter 7 Default coding
profiles and TCID settings
Lists the default codecs

About this manual
iv Vpacket 5100/6100 Series MGCP Telephony
Conventions
This manual uses typeface, syntax, and messages to alert you to information of special interest.
Typefaces
Table 2 lists the typefaces that are used in this manual.
Command syntax
The syntax of commands is described using the following conventions:
• Angle brackets (<fill_in_the_blank >) denote required parameters or arguments.
• Square brackets ([ ]) denote optional elements.
• A pipe (|) separates choices.
Messages
Notes, cautions, and warnings are posted throughout the manuals to give supplementary
information and encourage safety awareness and safe practices.
Notes
Notes are supplemental information requiring your attention.
For example:
Note. Please remember to go to the Vpacket Web site and complete the online
Warranty Registration Card. Doing so registers your Vpacket 5100/6100 VDR and
allows you to receive the latest information, technical support, and upgrades
applicable to your unit.
Table 2. Typefaces and their meanings
Typeface Description
Bold Designates menus, commands, and parameters
Courier Designates output resulting from a command issued by a user and messages
issued via a telnet or terminal-emulation screen

Related documentation
Vpacket 5100/6100 Series MGCP Telephony v
Cautions
Cautions are information requiring extra attention.
For example:
Caution. No system-level confirmation message appears during the deletion.
Warnings
Warnings are information that, if not followed, could result in injury or equipment damage.
For example:
Warning. Use of longer screws could result in damage to internal components.
Related documentation
The documentation set related to the Vpacket 5100/6100 VDR includes all documents on the
CD-ROM that was shipped with the unit:
•Vpacket 5100/6100 Series Voice/Data Router Installer’s Guide, Release 2.1
•QuickStartGuides
•T1 and dual T1 Quick Start Guide
•SDSL Quick Start Guide
•Ethernet WAN Quick Start Guide
•T1-PRI Voice Quick Start Guide
•Vpacket 5100/6100 Series Voice/Data Router Datasheet
The reference manual is broken down into five sections allowing you to print only the sections
that apply to your network environment:
•Vpacket 5100/6100 Series Voice/Data Router Reference Manual (Data Features)
• Vpacket 5100/6100 Series Voice/Data Router MGCP Telephony Configuration
• Vpacket 5100/6100 Series Voice/Data Router SIP Telephony Configuration
• Vpacket 5100/6100 Series Voice/Data Router H.323 Telephony Configuration
!
WARNING

About this manual
vi Vpacket 5100/6100 Series MGCP Telephony
Contact information
For more information about the Vpacket 5100/6100 Series VDRs, please contact us using any of
the following methods.
Voice calls
We welcome your calls at 1(866) 872-2538 (VPACKET) Monday through Friday, from 9:00 am to
6:00 pm Pacific Time. Voice mail is available during non-business hours.
E-mail
If you prefer, you can send information requests to our e-mail address: [email protected]
Fax number
You can also send your requests for information to our 24-hour fax number:
1(408) 433-5870
Website
Our website contains valuable information about our products. We encourage you to visit us at
http://www.vpacket.com

Contents
Vpacket 5100/6100 Series MGCP Telephony vii
About MGCP 1
MGCP and voice services over IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Setting up voice ports for MGCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Coding profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
TCID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Activating and storing configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Evaluating call quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Accessing MGCP commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Accessing the help feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Viewing the DSP version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Recommended FAX settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Coding profile commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Assigning codecs to coding profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setting the coding usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Viewing coding profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the voice information field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the nominal delay (jitter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the maximum delay (jitter). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the adaptive playout function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setting the DTMF relay mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting the VAD mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting an audio threshold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Setting the silence detect time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Setting a silence detection level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setting tone detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Enabling or disabling the echo canceller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Setting the processor mode for the echo canceller. . . . . . . . . . . . . . . . . . . . . . . 24
Setting the echo canceller tail length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Setting the echo canceller processor value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Setting the refresh state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Setting the echo canceller refresh coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

viii Vpacket 5100/6100 Series MGCP Telephony
CONTENTS
TCID commands 27
TCID commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Required TCID commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Assigning a TCID number and coding profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Setting the notify entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Setting the TCID endpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TCID FXS loopstart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Setting the on hook level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Setting the seize detect parameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Setting the originator clear detect parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Setting the answer-side clear detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Miscellaneous TCID parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Setting the TCID mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Setting the receive gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Setting the transmit gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Setting the idle noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Setting the TCID state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Copying the settings of one TCID to another TCID . . . . . . . . . . . . . . . . . . . . . . . 37
Setting tone out on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting tone out off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting a call length limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting the default digit map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Setting the default event list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Setting the partial digit timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Setting the critical digit timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Setting the type of service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
MGCP commands 43
MGCP commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Enabling T1 CAS for MGCP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Enabling MGCP to interoperate with a Nuera softswitch . . . . . . . . . . . . . . . . . . . 47
Setting the MGCP version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Viewing the MGCP code version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Viewing the current MGCP configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Setting the remote gateway name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Setting the DNS IP address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Enabling all endpoints to send messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Vpacket 5100/6100 Series MGCP Telephony ix
CONTENTS
Enabling or disabling recording of events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Setting the number of transmissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Setting the number of retransmissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Setting the restart wait time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Setting the nominal wait time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Setting a history limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Setting the initial time-out delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Setting the minimum time delay before a reconnect . . . . . . . . . . . . . . . . . . . . . . 56
Enabling event recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Enabling or disabling keep alive messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Setting the connection type attribute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
T1 interface commands 59
T1 voice interface commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Viewing the T1 configuration settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Setting the T1 frame mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Setting the T1 line coding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Setting the T1 clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Setting the T1 loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Voice quality commands 65
Call quality commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Enabling the call detail records feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Viewing the call detail record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Deleting CDR information from the Flash memory. . . . . . . . . . . . . . . . . . . . . . . . 68
Viewing CDR statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Data coding profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Default settings for TCID 0 and 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

x Vpacket 5100/6100 Series MGCP Telephony
CONTENTS

Contents
1
About MGCP
Overview, page 3
MGCP and voice services over IP, page 3
Setting up voice ports for MGCP, page 5
Activating and storing configurations, page 6
Evaluating call quality, page 6
Accessing MGCP commands, page 7
Accessing the help feature, page 7
Viewing the DSP version, page 8

CHAPTER 1
About MGCP
2 Vpacket 5100/6100 Series MGCP Telephony

MGCP and voice services over IP
Vpacket 5100/6100 Series MGCP Telephony 3
Overview
This chapter describes the capability of the 5100/6100 VDR to support IP telephony with the
media gateway control protocol (MGCP) and the commands available to configure the voice
ports using the Command Line Interface (CLI). MGCP is supported for FXS and T1-CAS
5100/6100 VDR models.
Note. If you are using MGCP with a digital T1 port, you need to set the T1 parameters
before setting any coding profile, TCID, or MGCP commands.
This chapter contains the following information:
• Background information about MGCP
• A description of the uses of telecommunication channels (TCIDs) and their coding profiles
for encoding the characteristics of traffic flow
• Procedures for accessing the telephony command shell and help features
MGCP and voice services over IP
The basic conditions that required bringing together data and voice routing capabilities were the
development of specialized telephonic applications connecting LAN devices, across a WAN, and
with interfaces to the PSTN. These required attention to several key areas:
• Operational differences between packet-switched and circuit-switched environments
• Major issues revolving on the management of bandwidth, QoS, and latency
These required the development of protocols capable of managing:
• Audio compression to reduce bandwidth
• Sensitivity to latency on the audio path–a 200ms round trip is considered acceptable
• Use jitter buffers and codecs that minimize the network impacts
MGCP provides the means to interconnect a large number of IP telephony gateways. MGCP
assumes that a call agent (CA) performs the intelligence of all call-control operations and that a
media gateway (MG) carries out all media processing and conversion.
MGCP provides an internetworking control system to control telephony gateways from external
call control elements are referred to as call agents. A telephony gateway is a network element that
provides conversion between the audio signals carried on telephone circuits and data packets
carried over the Internet or over other packet networks.

CHAPTER 1
About MGCP
4 Vpacket 5100/6100 Series MGCP Telephony
Example of gateways are:
• Trunking gateways provide an interface between the telephone network and a Voice over IP
network. Such gateways typically manage a large number of digital circuits.
• Voice over ATM gateways operate much the same way as voice over IP trunking gateways,
except that they interface to an ATM network.
• Residential gateways provide a traditional analog (RJ11) interface to a Voice over IP network.
Examples of residential gateways include cable modem/cable set-top boxes, xDSL devices,
broad-band wireless devices.
• Access gateways provide a traditional analog (RJ11) or digital PBX interface to a Voice over
IP network. These can be access gateways and include small-scale voice over IP gateways.
• Business gateways provide a traditional digital PBX interface or an integrated “soft PBX”
interface to a Voice over IP network.
• Network Access Servers attach a modem to a telephone circuit and provide data access to the
Internet. We expect that, in the future, the same gateways will combine Voice over IP services
and Network Access services.
• Circuit switches or packet switches can offer a control interface to an external call control
element.
MGCP assumes a call control architecture in which the call control “intelligence” is outside the
gateways and handled by external call control elements. The MGCP assumes that these call
control elements, or Call Agents, will synchronize with each other to send coherent commands to
the gateways under their control. MGCP does not define a mechanism for synchronizing Call
Agents. MGCP is, in essence, a master/slave protocol, where the gateways are expected to execute
commands sent by the Call Agents.
MGCP assumes a connection model constructed of endpoints and connections. Endpoints are
sources or sinks of data and could be physical or virtual.
Examples of physical endpoints are:
• An interface on a gateway that terminates a trunk connected to PSTN switch (for example, a
Class 5 or Class 4 switch). A gateway that terminates trunks is called a trunk gateway.
• An interface on a gateway that terminates an analog POTS connection to a phone, key
system, PBX, etc. A gateway that terminates residential POTS lines (to phones) is called a
residential gateway.
• An example of a virtual endpoint is an audio source in an audio-content (media) server.
Creation of physical endpoints requires hardware installation, while creation of virtual endpoints
can be done in software.
Connections may be either point-to-point or multipoint. A point-to-point connection is an
association between two endpoints with the purpose of transmitting data between these
endpoints. Once this association is established for both endpoints, data transfer between these
endpoints can take place.

Setting up voice ports for MGCP
Vpacket 5100/6100 Series MGCP Telephony 5
Setting up voice ports for MGCP
To enable voice services, you must individually set up each voice port. Each voice port needs to
have telephony channel identifier (TCID) parameters configured, a set coding profile and then
any coding profile parameters need to be configured.
Note. Vpacket strongly recommends that you use the supplied coding profiles listed in
Appendix D for initial configuration and system tests. Only when network quality
characteristics have been benchmarked and systematically tested, you can proceed
with customizing them.
Coding profiles
Coding profiles are configuration files that consist of numbered sets of parameters that control
the characteristics of the voice and fax traffic over the DSP channels. You can assign at least one
but usually two coding profiles (one for voice and one for fax) to a TCID as a way of providing
quick definition of services over that channel. Coding profiles setup and coding profile
commands begin on page 12.
Coding profiles can be used by any TCID assigned to a port on a 5100/6100 VDR but only one at
a time.
Vpacket has supplied eight default coding profiles, six for voice and two for fax. Each coding
profile uses one of the major industry standard codecs, including G.711 (A-law 64 kbps), G.711m-
law, G.723 5.3, G.723 6.3, G.726 (ADPCM), and G.729ab as well as two versions of T.38 fax.
Based on these coding profiles, you can create additional coding profiles for a maximum of 32
coding profiles. See “Advanced MGCP commands” on page 1 for more information.
When the VDR first boots up, all TCIDs are assigned the default coding profile 0 (G.711m- law).
TCID
The TCID represents the telephony (logical) channel associated with each analog port. They are
numbered as integers from 0 to (the number of voice ports on the VDR minus 1). For example,
the 24-port VDR (either 24 analog FXS ports or 24 channels in T1-CAS) has a TCID range of 0-
23. TCID setup and TCID commands begin on page 29.

CHAPTER 1
About MGCP
6 Vpacket 5100/6100 Series MGCP Telephony
Figure 1-1 shows the 5100/6100 voice ports, voice port numbers, TCID numbers, and coding
profiles.
Figure 1-1. Relationship between voice ports, TCID, and coding profiles
Activating and storing configurations
When a command is issued, it is placed in a temporary storage area where it can be stored or
removed by user operation. To implement a change, that command must be stored in Flash
memory with the activate command and then stored in the configuration file with a commit
command so when the VDR is rebooted it is part of the current configuration. When a sequence
of commands is entered and processed, it changes the values of the affected parameters in a
temporary area, but this does not affect current operation which uses values in the active area.
When you issue the activate command, the new configuration data is moved from the temporary
area to the active area, where it can actually be used. Thus a user can make multiple changes in the
temporary area, for example, using set coding commands, then put them into use with a single
activate command.
Use the activate command only between calls since when it is invoked, it tears down (disrupts)
any calls that are in progress.
Configuration data in the active area is only available while the software platform remains in
operation. If the reset command is issued, or if the platform is manually reset, the active area is
reloaded from the data stored in Flash memory. Data in the active area may be saved to Flash
memory by entering the commit command.
Evaluating call quality
A key feature of the VDR’s support for MGCP is the Call Detail Record (CDR) functionality.
CDR records every successful phone call which is placed through the VDR. Each successful
phone call will have one record in the CDR list. The System Administrator can extract and review
detailed records concerning phone quality and also can access these records for billing purposes.
12345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24
TCID 0 TCID 23
TCID 11
Coding profile 1
voice
fax
voice
voice
fax
fax
Coding profile 1
Coding profile 1
2
2
2
5100/6100 VDR voice ports

Accessing MGCP commands
Vpacket 5100/6100 Series MGCP Telephony 7
Accessing MGCP commands
MGCP commands are available within the command line interface (CLI) under the telephony
command shell. Once you establish connectivity to the 5100/6100 VDR either through a
HyperTerminal session or a telnet session, you can access the telephony shell by entering tel and
pressing the Enter key (Figure 1-2).
Figure 1-2. Entering the telephony command shell
Accessing the help feature
Once inside the telephony command shell, you can view a listing of MGCP commands by
entering either the set or show keywords (Figure 1-3).
Figure 1-3. Viewing MGCP help
If you enter a two word combination, you can view the entire list of available commands within
that group. The list contains both basic and advanced commands; so, it is possible to change
parameters that might adversely affect a network.
The commands are listed by group:
• Show commands
• Coding profile parameter command
• TCID parameter commands (including loop start options)
• MGCP parameter commands
• Call quality commands
VPacket# tel
telephony#
VPacket# tel
telephony# set
set tcid
set coding
set xgcp
VPacket#

CHAPTER 1
About MGCP
8 Vpacket 5100/6100 Series MGCP Telephony
Viewing the DSP version
You can view a character string that identifies the DSP software version by issuing the show
dsp_version command.
Syntax: show dsp_version [dsp]
Argument:
dsp the number of the DSP about which you want to view information
Example:
In this example, the DSP information is displayed.
MXP>show dsp_version 1
DSP Version: 6.2.3.107, Voice & Fax, @Small, C548F/C549F, Codecs 0xffd2, Features
0x1fe