For political & economic reasons, ISP may block VoIP in your country. To protect your VoIP business & profit, SpeedVoIP Communication Technology Co., Ltd. is providing Security VoIP software solution, VGSC 2008, which installed on client side¡¯s PC, and support your X-lite, Linksys PAP2 without any VoIP blocking. Key Features: Maximum call completion rate and maximum voice service duration SIP core standards and a variety of drafts supported Proprietary link layer protocol for controlling Any 3rd-party Softphone/ATA/Gateway/IPPhone/IAD and SIP Proxy/Registrar/SBC supported The most comprehensive codec including g.711/g.723/g.729ab/iLBC/gsm/speechX supported Bypassing Narus and Verso platform detection Flexible user-customized encryption policy driven Strict call path protection and security up to termination Only simultaneous signaling/media/T.38 fax packet support across any firewall. No network or firewall modification is required. Excellent voice quality without any latency and performance compromise Available on all major platforms.