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The SmartNode 4120 ISDN gateway allows conversion of 2 basic ( BRI or BRA) ISDn accesses into 4 VoIP channels.It supports all major VoIP standards, SIP, H.323, T.38 fax, G.729 Codec, ensuring high standards in quality and performance.The SmartNode 4120 integrates seamlessly into modern IP PBXs, supp..