... matching FXS and FXO interfaces,Uses the powerful performance processing IBM chip, clocked at 333M,Used with high-performance AudioCodes ... Features 1,Modular structure,Analog ground for,Relay Access,Call Center,Branches of large companies,SME internal extension, many occasions ... can switchboard ext; Support each other within the port call Support port forwarding, then rob, secondary dial, hotline FXO ...