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Vierling are a german manufacturer of quality fixed wireless terminal and GSM gateway products. GSM Gateways connect to a phone system to provide a low cost means of calling mobile phones.
 BRI GSM Gateways
The Vierling ECOTEL ISDN Gateways connect to a BRI port on a phone system and provide either 2, 4 or 8 mobile lines.
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VOIP GSM Gateways
The Vierling ECOTEL VOIP Gateways connect to an Ethernet port on a VOIP phone system and provide either 2, 4 or 8 mobile lines.
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 PRI GSM Gateways
The Vierling VTM Pro Gateways connect to a PRI or E1 port on a phone system and provide either 8, 12, 16, 20, 24, 28 or 32 mobile lines.
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