FonoSIP.com. We provide IP PBX Software and VPN secure centrex service. FonoSIP.com supports Xten / Counterpath SIP softphones and Internet telephony equipment such as Sipura 2000, Sipura 3000, Cisco 186, Linksys PAP2, RT31P2, WIP300. D-Link DVG-1402SL, UTstarcom F3000. Nokia E60 E61i N70 95. Symbian OS. Windows Mobile 6. Apple iPhone, T-Mobile Dash. Fring. We also support Asterisk PBX, TrixBox and offer VoIP PBX software for businesses, resellers, ITSPs and campus applications. Unified Communications.