Designed specifically for call centers and enterprises. The Blackwire 3220 USB Type-A Corded Stereo UC Headset from Plantronic works with Windows platform and USB devices.. One of the best headset for small budget.
List of products by brand OpenVox
The Openvox PRI Card DE210P offers 2 ports of PRI (E1 or T1) interface to SIP server. With this card you can accomodate maximum 60 simultaneous calls. This card has broad interoperability with various telephony systems including asterisk, freepbx, yate etc. Echo cancellation module providers carrier grade call quality even at higher volume.
4 T1/E1/PRI w/ RJ-48 2 10/100M Ethernet ports 2 USB 2.0 ports DGW-1004R with redundant power supply