Yeastar Used to expand RJ11 interfaces. It could be
installed max. 4 module like S2, O2, SO, BRI, GSM, CDMA
and UMTS.

Yeastar Used to expand E1/T1 interfaces. It support 1 E1/T1
interface

Yeastar 2 FXO Ports

Yeastar SIP Ext.: 100 by default ( max. 200)
Concurrent call: 30 by default (max. 60)
Expand Cards: max. 2 EX08/ EX30 & 1 D30
Analog Ports: max. 16 FXS/FXO ports
BRI Ports: max. 16 BRI ports
GSM Ports: max. 6 GSM ports
E1/T1 Ports: max. 2 E1/T1 ports
Storage: SD Card / USB

Yeastar SIP Ext.: 300 by default ( max. 500)
Concurrent call: 60 by default (max. 120)
Expand Cards: max. 3 EX08/ EX30 & 2 D30
Analog Ports: max. 24 FXS/FXO ports
BRI Ports: max. 24 BRI ports
GSM Ports: max. 6 GSM ports
E1/T1 Ports: max. 3 E1/T1 ports
Storage: SD Card / USB / Hard Disk

Yeastar SIP Ext.: max. 50
Concurrent call: max. 25
Analog Ports: max. 8 FXS/FXO ports
BRI Ports: max. 8 BRI ports ports
GSM Ports: max. 4 GSM ports
Storage: SD Card
Expand Slot: Not support