The Grandstream HT881 is an ideal VoIP gateway for businesses of all sizes, providing FXO and FXS ports for PSTN line calling, advanced telephony features, automated provisioning, and excellent voice quality. It features 8 RJ11 FXO ports and 1 RJ11 FXS port, supporting caller ID display/block, call waiting, flash, blind/attended transfer, forward, hold, do not disturb, and 3-way conference.