1 x E1 Port, Only for S100 & S300
All the telephony interfaces are modular and customizable, whether it’s FXS, FXO, ISDN BRI/PRI, or GSM/3G/4G. S100, S300, P560, P570 require the combination of the Expansion Board and Telephony Modules to add interfaces. EX30 has 1 onboard E1/T1/PRI port.
- S20 has 2 onboard module slots
- S50, S412, and P550 have 4 module slots
- P560 allows 1 Expansion Board
- S100 and P570 support 2 Expansion Boards
- S300 supports 3 Expansion Boards
