As far as I know, some solution get blocked in some countries. Even the latest version can't avoid its fates.
In the meantime, VGCP has good news for us. The latest version of VGPlug in and VGSC come out.
It's the newest version for encryption and decryption. It can help wholesaler, ITSP and reseller bypass ISP block VoIP problem stably, but also it have high voice quality. No crash and delay at all.

Compare to others, Voice Gaurd has these unforgettable advantages:
1. Client don't need to change their ports almost everyday.
2. More and unlimited concurrent call. Others support a few of concurrent call. If it takes more lines, the calling is muss.
3. High voice quality.
4. More cost-effective.
5. Supports any 3rd-party softphone / ATA / Gateway / IP Phone / IADs, such as Linksys PAP2, X-Lite, etc.

Lynn
MSN: svoipsales@hotmail.com
Homepage: www.speed-voip.com