Grandstream 2 Port E1/T1 Gateway GXW4502Grandstream 2 Port E1 T1 Gateway GXW4502 The GXW4500 series of Digital VoIP Gateways offers three models that provide 1, 2 or 4 software configurable E1 T1 J1 spans and support 30, 60, or 120 concurrent calls. The GXW4500 series are E1 T1 Digital VoIP Gateways that allow digital PSTN and ISDN trunks to be integrated with VoIP networks. By connecting the GXW4500 series with a VoIP network and a traditional PBX or E1 T1 J1 provider, businesses can