The Rhino R4FXO-EC is a next generation analog PCI card for use with Asterisk and other open source telephony platforms. The R4FXO-EC features an on-board control element and on-board Echo Cancellation Circuit. The on-board control element prevents PCI bus "bit banging" which allows for lower CPU power, while the on-board Echo Cancellation circuit provides echo protection to ensure crisp clean calls.

Rhino R4FXO-EC Features & Functionality
Asterisk soft PBX tested and ready

Zaptel-compliant open source Linux module source code
Proven Silicon Labs FXO DAA component - Si3050
Silicon Labs international line interface device - Si3019
Custom Rhino PCI interface chip means no excess CPU overhead
Four RJ11 jacks at card bracket
Field software upgradable
All major signaling modes supported
Loop start signaling for advanced features such as Caller ID and Distinctive Ring