SpeedVoIP Debuts VoIP Anti-Blocking.

VoiceGuard™ is versatile and powerful VoIP anti-blocking solution for ITSP and VoIP Reseller which can protect call completion and lead to maximum service duration while prevent revenue leakage for ITSP, which can work with any 3rd-party SIP proxy or server.
VoiceGuard™ VoIP Adapter (VGSPE) for security & anti-blocking function, available in 1-, 2-, 4-port FXS & FXO models
VGSPE VoIP Adapter Comparison Chat

VGSPE Model      Ethernet Ports      FXS Port      FXO Port      PSTN pass-through Port      USB-B Port
VGSPE-1.1    2RJ45 (LAN/WAN)    1    0    Yes    Yes
VGSPE-1.1 Pro    2RJ45 (LAN/WAN)    1    1    Yes    Yes
VGSPE-2.1    2RJ45 (LAN/WAN)    2    0    Yes    Yes
VGSPE-2.1 Pro    2RJ45 (LAN/WAN)    2    1    Yes    Yes
VGSPE-4.0    2RJ45 (LAN/WAN)    4    0    No    Yes
VGSPE-4.2 Pro    2RJ45 (LAN/WAN)    4    2    Yes    Yes

Key Benefits:

  Minimal Overhead and High Call Quality
  Easy to Use and Cost-effective
  Any 3rd party SIP proxy/Registrar/SBC supported
  Support termination server blockade

For more inform, pls review: http://www.speed-voip.com

Lynn
MSN: svoipsales@hotmail.com
Skype: svoipsale
MSN: s