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Amazon.com : T1 Card E1 Card,Te420 ISDN Pri Voice Board with 4 E1/T1 Ports,te420e Asterisk Card,PCI-E,Issabel FreePBX for VoIP Phone System IP PBX : Office Products
Amazon.com: Dinstar DAG1000-8O 8 FXO Ports Analog VoIP Gateway Simple Operation : Office Products
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Amazon.com : Patton Electronics - SN4970/1E24V/EUI - 1 T1/E1 PRI VoIP Gateway, 1x GigEthernet, 24 VoIP channels; upgradeable to 30, Extern : Office Products
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