The CooVox-U100 IP SIP Server is an ideal solution for up to 500 extensions. Adopting the innovative modular design, it is very convenient to increase telephony ports to expand the system. CooVox-U100 supports industry standard SIP trunks, analog PSTN trunks (FXO Module), analog stations (FXS Module), and mobile GSM/WCDMA trunks (GSM/WCDMA Module). CooVox-U100 is a next-generation Hybrid IP PBX System designed and optimized for today’s business telecommunication needs. CooVox-U50 is an affordable, scalable, interoperable, secure and reliable solution which provides not only traditional PBX features such as Automated Attendant and Voicemail, but also many advanced features including Remote Extensions, Remote Office Connection, Conference Bridge, Call Recording, Call Detail Records (CDR), Automatic Call Distribution (ACD), Unified Messaging (Voicemail to Email), Web Dial and many more features.