... IP Call Center; 2. Modular design with maxima 32 FXS/FXO; Advantage:1. Expandable with modular design (Two modules,one ... interface between PSTN and IP to achieve the conversion between FXO/FXS and VoIP SIP,meanwhile complete the media stream transformation ... ·As a IPPBX, support that other terminals register on it. ·Support any switch among FXO, FXS, SIP; ·Support automatic routing function; ·Support ...