... Designed to run on a variety of VoIP applications, the IP PBX provide IP-based communications, voice conferencing, support paging /intercom, call ... the ZX50 utilizes standard PSTN lines via the interfaces of gateway to support seamless communications among local calls, SIP-based ... 711-Alaw, G.726, G.729, GSM, SPEEXSIP/IAX Extensions(connect with IP Phone)Zap Extensions(connect with Analog PhoneCall ...