Sorry for low quality and just ripping a press release but its summer 
From the press release http://www.aastrausa.com/2011-press-releases_2310.htm
Aastra, a leading company at the forefront of the enterprise communication market, today announced they have successfully completed interoperability testing with SmartSIP 2.0 for Microsoft® Lync™ Server 2010 from Network Equipment Technologies (NET). This interoperability allows Aastra’s award winning SIP-DECT mobility solution and broad portfolio of standards based SIP phones, to be used as voice endpoints on Microsoft® Lync™.
NET’s SmartSIP 2.0 is a software application that provides Lync voice interoperability for SIP devices. The application also includes functionality for determining presence for SIP devices inside Microsoft Lync environments. SmartSIP 2.0 extends enterprises’ existing SIP endpoints, and enables 802.11 WiFi and DECT wireless devices to be used in conjunction with Microsoft Lync.
“The combination of SmartSIP 2.0 with Aastra’s SIP-DECT products delivers an enterprise-grade mobility solution for organizations deploying Lync,” said Tim Whittington, Executive Vice President and General Manager, Aastra USA Inc. “SIP-DECT provides much greater flexibility and mobility for those enterprises while enabling them to still take advantage of presence and other productivity tools desired in a Unified Communications implementation.”
Aastra’s SIP-DECT handsets operate just as any other SIP endpoint on the IP network, but provide the added mobility necessary in many industries such as healthcare, retail, hospitality, and distribution/logistics. One of the primary advantages of DECT technology over WiFi is that it operates in its own spectrum so that it doesn’t compete for bandwidth with other devices, resulting in better quality and security through special encryption algorithms. Another big advantage is that DECT requires considerably less power than Wi-Fi so DECT phones have muchlonger talk and standby times. Aastra’s SIP-DECT is also highly scalable and includes a variety of handsets to suit a range of business requirements.
For more information or to see Aastra’s SIP-DECT endpoints, visit Aastra in Booth #339 or NET in Booth #336 at Microsoft World Partner Conference in Los Angeles, July 11-14.