AddPac Hybrid IP-PBX Systems is a next-generation IP-PBX System and a new IP telephony solution for all IP environment and traditional PSTN network. Hybrid IP-PBX inter-works with various IP terminals of AddPac (e.g. AP-VP300, AP-VP280, AP-VP250, AP-VP150, AP-VP120 IP Video Phones, and AP-IP300, AP-IP230, AP-IP160, AP-IP120, AP-IP90 IP Phones) and analog phones(low cost compared with IP terminals, also reused) to provide multimedia IP telephony services as well as the traditional legacy PBX features. This Hybrid IP-PBX product is based on the advanced embedded RISC that enables firmware upgrade, and can be equipped with various VoIP interfaces (FXS, FXO, Digital E1/T1, etc) depending on module options. AddPac Hybrid IP-PBX solution is suitable for small and medium size companies, and inter-works with the VoIP and video products of AddPac Technology to provide a variety of IP application services appropriate for your network. Also, AddPac Hybrid IP-PBX System supports H.323 VoIP inter-working as well as SIP protocol for outbound call.