http://www.plsbuy.com/USB_Skype_Adaptors.html

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USB Skype Adaptor V04
USB Skype Adaptor service office existing PBX system without any
change Supports 4 lines Skype call in and call out at the same time...
Product Type:USB Skype AdaptorProduct Price :USD$269.99Details:
USB Skype Adaptor V15
USB Skype Adaptor V15 is a perfect solution for wireless Skype,
SkyDECT is the next generation VoIP adapter that allows the use of
Skype with DECT phone... Product Type:USB Skype AdaptorProduct
Price :USD$69.99Details:
USB Skype Adaptor V18
USB Skype Adaptor V18 provides the high quality of VoIP communication
by easy connection to the Internet... Product Type:USB Skype
AdaptorProduct Price :USD$79.99

Features:

Seamless integration of Skype service into office existing PBX system
without any change
Supports 4 lines Skype call in and call out at the same time
Unique enterprise Skype account as hunt group with automatic
distribution for all incoming Skype calls
Unlimited speed-dial contacts, Seamless integration with Skype
Up to 10,000 Skype contact speed-dials
Centralizes all Skype activities to a single server especially for
enterprise management
Powerful web visit for contacts management and log check
Uses only one Windows account to handle 4 Skype accounts
Supports 4 inbound and/or outbound calls concurrently
Excellent sound quality
Automatically finds a free line/port for the incoming or outgoing
Skype ca
Works with the existing PBX to provide other telephony features such
as Call Transfer, Call Pickup,Call Hold, Call Waiting, Conference
Call... etc. (PBX dependent)