Just found these new cards. I was wondering if anyone has any experience or opinion about them. Do they use the same hybrid chip as Sangoma or Digium? What about PCI interface. It comes with 4 FXO ports onboard which has it's advantages I suppose. Does not look like there is any hardware echo can option though. http://www.rhinoequipment.com/R4FXOCard.html Looks like they have a T1 card as well.