Hi,
Would you please check the following guide on integrate Lync voice with AudioCodes MP 118 to see if you miss something on your configuration, (I think the configuration will be similar to MP 114)?
http://www.lynclog.com/2011/04/analog-phone-support-with-lync-2010.html
Another infromation about MP-114 pre-configured Board.ini for Lync 2010 for your reference.
http://www.lynclog.com/2011/04/mp-114-pre-configured-boardini-for-lync.html
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Best Regards,
Eason Huang