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MIGRATION CONFIGURATION GUIDE
Dialogic DMG2000 to Sangoma Vega 400GF for SR140 Fax Applications
Vega 400GF is a variation of the Vega 400G specifically designed for fax customers, and replaces the End of Life Dialogic® DMG 2000 series of gateways. The 400GF includes hardware Error Correction and a High Precision Clock for accurate fax transmission.
This guide describes how to setup a Sangoma Vega 400GF, and is geared especially for existing DMG 2000 customers using Fax in SR140 or equivalent applications.
Purpose:
While IP-to-TDM gateway configuration across different makes and models is based on the same telephony concepts, configuration interfaces vary. This document provides a quick start guide to users of the Dialogic DMG 2000 with SR140 fax solution who are migrating to a Sangoma Vega 400GF with SR140 fax solution. This document is not intended to replace the Vega 400GF manuals, since it is not a complete configuration guide, but rather focuses on key areas that relate to fax functionality.
Prerequisite:
Users are advised to first familiarize themselves with theInitial configuration Vega 400 E1/T1 (SIP) – R7 manual, since the areas discussed here will only be complementary that.
Configuration Areas of focus:
SR140 fax client
Local IP Address on the Gateway
Gateway Fax Media
Gateway Fax Error Correction Mode
Gateway TDM Ports
Gateway Routing
SR140 Fax Client Software:
1) Change the gateway IP address to that of the Vega Gateway:
Brooktrout Configuration Tool > IP Call Control Modules > SIP > IP Parameters > Primary Gateway:
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2) T.38 Versions:
Brooktrout Configuration Tool > IP Call Control Modules > SIP > T.38 Parameters > Maximum T.38 Version: Set to either version 0 or 1.
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3) Disable V.34:
V.34 is not supported on the Vega 400GF in T.38 mode and, while the Vega will not fail fax calls originating from end points enabled for V.34, it is advised to disable it on the SR140: Brooktrout Configuration Tool > BTCall Parameters > Advanced Settings, and set all three parameters that have to do with V.34 to ‘Disable’ when using T.38.
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Please Note: The Vega does support V.34 modulations in G.711 Fax Pass-through mode, therefore this configuration is only advised for T.38 fax: |
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LOCAL IP ADDRESS ON THE GATEWAY:
The DMG2000 supports only static IP addresses:
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On the Vega 400GF, the IP address type is by default set to DHCP, therefore when the unit is connected to a network that has a DHCP server, the Vega picks an IP address. This IP address can be discovered either via the serial connection (a serial cable ships with the Vega package), or by using the free VS_Scanner utility. However, once the IP address is discovered and system accessed via web configuration GUI, the IP address can be allowed to remain dynamic, or changed to Static by going to the Expert Config > LAN/WAN page, and removing the checkmark on DHCP. This page also enables the user select allowed Ethernet types, for example 10TBaseT, 100BaseT, and 1000BaseT:
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GATEWAY FAX MEDIA:
On the DMG2000, T.38 or G.711 pass-through fax is enabled in the Configuration > VoIP > Media > Fax > Fax IP-Transport Mode parameter:
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ENABLING FAX ON THE VEGA 400GF:
On the Vega 400GF, enabling fax is a three-step procedure, which is typically as follow:
Step 1: SIP > Miscellaneous menu – highlighted settings would work as the default DMG2000 settings:
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Step 2: Create a Media Capability Set - Media > Media Capability Set: In most cases there would not be a need to modify the Media Capability list. However, the Media Capability Set is created by selecting from the list, for example, for T.38 fax:
- Click ‘Add’ under Media Capability Set table, or ‘Modify’ to customize an existing set.
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To create a G.711 pass-through capability set, the media capability and profile mode would be as in Capability Set 3 in the above screen shot - a G.711 codec and a profile mode of DataOnly.
Step 3: Set the Media Control / Packet Profile:
Click on the Media Control Profiles link, to view or change Packet Profile is use:
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Expand Packet Profiles, and then the specific profile number selected in Media Control Profiles, in this case #1. Set Echo Canceller, Adaptive Playout Mode, and Fax Transmit Level to the values shown in this screen shot:
Step 4: Return to the SIP menu – SIP > SIP Profile:
In this step, the Media Capability Set that was created in Step 2 is associated with the profile:
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GATEWAY FAX ERROR CORRECTION MODE:
DMG2000: Error Correction Mode (ECM) is enabled by default: Configuration > DSP Settings T.38 Fax Advanced Settings > Allow T.38 ECM Faxes.:
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Use ‘show’ to confirm further:
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GATEWAY TDM PORTS:
DMG2000: Config > TDM T1/E1:
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VEGA 400GF:
This is configured via the E1/T1 menu, and is quite intuitive. The ‘Crossover’ setting, which is not available on the DMG 2000 can be quite helpful as far cabling is concerned. It enables the use of either a crossover or straight-through cable.
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Preferred audio codec for the TDM port can be selected from the E1/T1 > Advanced E1/T1 Port Configuration table:
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Viewing TDM Port Status:
DMG2000:
Status > Summary page:
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From the Status > Interfaces page, click the Show button:
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GATEWAY FAX ROUTING:
This is the configuration known on the DMG2000 as Routing Table. On the Vega 400GF, it is called the Dial Plan:
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The Dial Plan menu is grouped into Profiles, Planner Groups, Call Presentation, and five others. However, a basic working fax system requires that at least Profiles be configured dial plan. A basic dial plan configuration is presented here, but a more elaborate example requires a good understanding of the Dial Plan configuration in the Initial configuration
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Initial Dial Plan screen may look similar to this: v
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At least one profile is required for each direction in order to successfully route calls:
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