Modules and Boards

Yeastar 4G LTE Module

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Yeastar 4G LTE Module (YST-4G)

Yeastar 4G LTE Module enables 4G cellular data on SIM card, making the 4G LTE become the primary Internet connection for S-Series VoIP PBX. Supporting 3G/4G network standard, the 4G capable S-Series VoIP PBX can register SIP trunks and make SIP calls with high speed built-in data. It is ideal for business needs of temporary locations, mobile offices,and places where a fixed-line broadband is not available.

4G LTE Network provides businesses with an essential Internet continuity option when the PBX’s primary Internet connection fails.With 4G LTE failover, SIP trunks are even more resilient. Place the phone call over LTE connection, you can expect faster voice connection, high-definition call quality and other benefits that VoLTE will offers to companies.

This module must be placed into Module Slot 1 of the on-board module slots for the S412, S20, and S50. It requires an expansion board and must be placed in Module Slot 1 of Expansion Board 1 in the S100 or S300 units.


  • Enables 4G cellular data on SIM card
  • Voice over LTE for faster voice connection and better call quality
  • 4G LTE network failover for business continuity
  • Great for branch offices, remote areas, and temporary offices!


  • Yeastar S-Series: S20, S50, S100, S300 (Version or higher)


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