voip, ip pbx,voip pbx,china voip manufacturer Houyuan Techology (HK) Limited ( houyuanhk.com ) was found in 2009 . We mainly produce IP PBX,VOIP products,RFID and other elecronic products. The IP PBX is a complete Asterisk Appliance with one XO or FS module .Tt is an embedded open source Linux system with built-in SIP/IAX2 proxy server and NAT funtiongs. Tt provides a solid,uniform platform for traditional PSTN communications as well VoIP communications. Houyuan Technology(HK) Limited http://www.houyuanhk.com Contact: olive Email:olive@houyuanhk.com Skype: olivewanghy Tel: 86-755-66802154 Fax: 86-755-27286550 Add: FL2,Block D,#438 shajing east road,baoan district,shenzhen China