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If I have an E1 PRI ISDN GSM gateway (VCL-GSM E1 PRI-30), DX 2030 (Digital E1 VoIP router/gateway Quintum and Internet access of 512 upstream and downstream, can I successfully terminate calls without any connection to the PSTN?
The VCL-GSM E1 PRI-30, this appears only to be a GSM to E1 PRI converter. It therefore has no connection to the IP network to route a call as a VoIP call to the Quintum gateway. You need to have the ability to support VoIP calls on both gateways to bypass the PSTN. A GSM to SIP gateway would be a more appropriate fit here.