The TG Range is a series of IP to GSM/3G/4G gateways, connecting 3G WCDMA or 4G LTE network to the VoIP network directly.
Ip Gateways can support two-way communication: GSM/3G/TG to VoIP or VoIP to GSM/3G/4G.
It is the best solution ever to connect IP-based telephone systems, and soft-switches to GSM/3G/4G network; and also, the best fallback solution when landline goes down.