SpeedVoIP Debuts VoIP Anti-Blocking.http://www.speed-voip.com/vgclientsdkcomparison.htmlFor political & scheme reasons, ISP haw country VoIP in your country. To protect your VoIP playing & profit, SpeedVoIP Communication Technology Co., Ltd. is providing Security VoIP code solution, VGSC2009, which installed on the PC at the client side.Key Features:•  Maximum call termination rate and peak voice assist continuance •  SIP core standards and a variety of drafts based •  Proprietary unification layer protocol for controlling •  Any 3rd-party Softphone/ATA/Gateway/IPPhone/IAD and SIP Proxy/Registrar/SBC based •  The most broad codec including g.711/g.723/g.729ab/iLBC/gsm/speechX based •  Bypassing Narus and Verso platform detection •  Flexible user-customized coding contract driven •  Strict call line endorsement and section up to termination •  Only simultaneous signaling/media/T.38 copier packet hold across some firewall. •  No meshwork or firewall change is required. •  Excellent voice calibre without some latency and performance cooperation •  Small footprint terminal SDK . •  Available on every major platforms. Pls review: http://www.speed-voip.com for info & intend liberated trial at http://speed-voip.com/download.html