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Enable fast cellular connectivity in your Yeastar S-Series Modular IP PBX with the Yeastar 4G LTE Module. This module makes a 4G connection the primary network connection for the IP PBX, perfect for situations where broadband connectivity is not available or you need a failover to backup your internet connection. You can then register SIP trunks and make SIP calls using 4G. Insert this module into the appropriate slot in the IP PBX.