From a competitive perspective, all of our competitors provide integration with Lync (though with different mechanisms):
Cisco - http://www.cisco.com/en/US/docs/voice_ip_comm/cucimoc/8_5/english/quickstartvideo/cucimoc85_quickstartvideo_mp4.html
Mitel - http://www.mitel.com/products/conferencing-and-collaboration/microsoft-uc-integration/direct-sip/
Aastra - http://www.aastrausa.com/microsoft-uc-integration.htm
When user is logged into to workstation and Communicator / Lync , authenticated to ACE AIE Services is done in the background No User intervention is required.
Voice with Lync can be enabled via: Lync Server 2010 Plus CAL: The Lync Server 2010 Plus CAL offers enterprise voice telephony features. It provides high-quality voice and other related features to users anywhere with an Internet connection across IP phones, PCs, and desktop applications. Cost is $107 per user. $76 higher than the Standard CAL used for Presence/IM (costs $31)