Grandstream Networks, Inc. is a leading designer and manufacturer of innovative and ultra-affordable VoIP terminal products for both wired and wireless networks..Grandstream VoIP products deliver market leading superb sound quality and rich functionalities at mass-affordable price.
More Details - http://www.grandstream.com/

FahdTel Inc. is a company with long experience of wireless/mobile tele- & datacom products & services. FAHDTEL sees a major trend driving the adoption of wireless/mobile broadband.
More Details - http://www.Fahdtel.com/

Multi-Tech Systems is a global manufacturer of award winning Voice over IP, Internet access, remote access and modem products that allow people to communicate more efficiently and effectively.
More Details - http://www.multitech.com/

Ingate Systems is a technology company that produces the world's first SIP-capable enterprise firewalls and SIParators (a piece of hardware that SIP-enables existing firewalls) for enterprises of all sizes. Ingate is located in Stockholm and Linköping, Sweden and its wholly owned subsidiary, Ingate Systems Inc., is located in Hollis, New Hampshire.
More Details - http://www.ingate.com/