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Grandstream GXW4501 Digital VoIP GatewayE1/T1/J1 Digital VoIP Gateway for integrating digital PSTN and ISDN trunks with VoIP networks1 software-configurable E1/T1/J1 port that supports PRI, SS7 and MFC R2Dual Gigabit network ports with a configurable integrated NAT routerAllows for 30 concurrent calls, multi-language voice prompts, and T.38 fax capabilitesAutomated provisioning by HTTPs/TFTP with XML config filesSupports nearly all voice codecs including Opus, G.722, G.711, G.729, G.723, iLBC, G.726, GSM-FR etc.Includes 2 USB 3.0 ports and 1 SD card interface
