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DSI-VC3 phones (UT4140) are only to be used as a part of a PBX based phone system and NOT to be used on a PSTN. PBX models such as: NEC models: SV8100, SV8300, SV8500, SV9100, SV9300, SV9500 Panasonic models: KX-TDE100, KX-TDE200 and KX-TDE600...
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