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Yeastar TG400L is a VoIP GSM/3G/4G gateway, connecting it to your VoIP network enables you to make two-way communications. Yeastar TG400L can be used to increase your capacity to receive larger volumes of calls. With support for 4 LTE ports and support for many voice codecs, Yeastar TG400L is the best fallback solution when the landline goes down.