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VoIP Trunking with a Legacy PBX
This configuration note is a step-by-step guide to set up a Mediatrix gateway to provide VoIP trunking with a legacy PBX.

The Mediatrix digital gateway is configured to either:
- Receive calls from the PBX and route them to the VoIP network (right to left):
- Receive calls from the VoIP network and route them to the PBX (left to right)
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Information to Know Before Starting
Before starting to use these configuration notes, complete the following table to make sure you have the required information to complete the different steps.
Information | Value | Used in Step |
---|---|---|
IP address of unit | Logging on to the Mediatrix Unit Web Interface | |
IP address or FQDN of Registrar host | Configuring the Default SIP Servers | |
IP address or FQDN of Proxy host | Configuring the Default SIP Servers | |
Type of endpoint used | BRI, PRI and/or FXO | Creating a Hunt Group - PSTN |
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Configuring the Mediatrix Digital Gateway
Logging on to the Mediatrix Unit Web Interface
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Configuring the Default SIP Servers

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Registering a Unit to All Gateways
- Go to SIP/Registrations.
- In the Unit Registration table, enter in the User Name, a username to uniquely identify the user in the domain.
- From the Gateway Name selection list, choose All.
- Repeat steps 2 and 3 for each SIP account/Registration needed.
- Click Apply and Refresh.
- Click restart required services located at the top of the page.

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Configuring Unit Authentication
Unit Authentication applies to all challenges received for SIP dialogs. You can define several user names and passwords for the Mediatrix unit. These usernames and passwords apply to all endpoints of the unit.

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Creating a Hunt Group - PBX
- Go to Call Router / Route Config.
-
In the Hunt table,
click
.
-
In the Configure New Hunt table, set the following:
- Set the Name field to hunt_PBX.
- Using the Destinations selection list, add the destination endpoints to use.
- Leave the other fields with their default value.
- Click Save.

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Creating a Route from Sip-Default to hunt-hunt_PBX
- Go to Call Router / Route Config.
-
In the Routes table,
click
.
-
In the Configure Route table, set
the following:
- Set the Sources field to sip-default.
- Set the Destination field to hunt-hunt_PBX.
- Leave the other fields with their default value.
- Click Save.

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Creating a Route From PRI/BRI/FXO ports to Sip-Default
- Go to Call Router/Route Config.
-
In the Routes table,
click
.
-
In the Configure Route table, set
the following:
- Click Save.

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Saving the Routes
- Go to Call Router/Route Config.
- Scroll to the bottom of the page.
- Click Save.
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Configuring ISDN
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Configuring the Country for all Endpoints
- Go to Telephony/Misc.
- Make sure the Select Endpoint drop-down list is set to Default.
- In the Country table, select your country from the drop-down list.
- Click Apply.

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Configuring DTMF Transport
- Go to Media/Misc.
-
In the DTMF Transport
table, set the Transport Method to the one
set in the VoIP server.
- In-band
- Out-of-Band using RTP (RFC2833). This is usually the preferred method. Remember to set the payload type if different (e.g.: 96, 101 or 110 in some cases).
- Out-of-Band using SIP. For Cisco or Avaya systems, from the SIP Transport Method field, use Info DTMF Relay. For legacy Nortel and others, leave Draft Choudhuri SIP Info Digit 00.
- Signaling Protocol Dependent: choose this method if unsure. It will try to use the method negotiated by the VoIP server.
- Click Apply.

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Optional Step
Configuring the Keep Alive feature
- Go to SIP/Servers.
- In the Keep-Alive table, complete the fields as required.
- If you selected an alternate destination, complete the fields of the Alternate Destination table.
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Additional Configuration
- If you need to add/remove digits, configure different destinations based on calling or called number, or other transformations, refer to the Call Router Basic Routes Configuration .
- For advanced analog port settings such as Caller ID or Tone Detection, refer to POTS Configuration (FXS-FXO).
- For ISDN settings, refer to the ISDN User Guide.
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Online Help
If you are not familiar with the meaning of the fields and buttons, click Show Help, located at the upper right corner of the Web page. When activated, the fields and buttons that offer online help will change to green and if you hover over them, the description will bedisplayed.
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DGW Documentation
Mediatrix devices are supplied with an exhaustive set of documentation.
Mediatrix user documentation is available on the Media5 Documentation Portal.
- Release notes: Generated at each GA release, this document includes the known and solved issues of the software. It also outlines the changes and the new features the release includes.
- Configuration notes: These documents are created to facilitate the configuration of a specific use case. They address a configuration aspect we consider that most users will need to perform. However, in some cases, a configuration note is created after receiving a question from a customer. They provide standard step-by-step procedures detailing the values of the parameters to use. They provide a means of validation and present some conceptual information. The configuration notes are specifically created to guide the user through an aspect of the configuration.
- Technical bulletins: These documents are created to facilitate the configuration of a specific technical action, such as performing a firmware upgrade.
- Hardware installation guide: They provide the detailed procedure on how to safely and adequately install the unit. It provides information on card installation, cable connections, and how to access for the first time the Management interface.
- User guide: The user guide explains how to customise to your needs the configuration of the unit. Although this document is task oriented, it provides conceptual information to help the user understand the purpose and impact of each task. The User Guide will provide information such as where and how TR-069 can be configured in the Management Interface, how to set firewalls, or how to use the CLI to configure parameters that are not available in the Management Interface.
- Reference guide: This exhaustive document has been created for advanced users. It includes a description of all the parameters used by all the services of the Mediatrix units. You will find, for example, scripts to configure a specific parameter, notification messages sent by a service, or an action description used to create Rulesets. This document includes reference information such as a dictionary, and it does not include any step-by-step procedures.
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Copyright Notice
Copyright © 2023 Media5 Corporation.
This document contains information that is proprietary to Media5 Corporation.
Media5 Corporation reserves all rights to this document as well as to the Intellectual Property of the document and the technology and know-how that it includes and represents.
This publication cannot be reproduced, neither in whole nor in part, in any form whatsoever, without written prior approval by Media5 Corporation.
Media5 Corporation reserves the right to revise this publication and make changes at any time and without the obligation to notify any person and/or entity of such revisions and/or changes.