I saw that lync 2013 make a Loop when it receive a call from PSTN (with the right format E164) toward a number not yet associated to a Lync User. Lync send back the call to the PSTN Gateway which generate a Loop.
I know that there is a Unassigned number feature but with the large range of number managed by lync in my network i cannot manage every day to change the range of number not yet assigned. Sometime i have only 5 or 10 numbers really associated to Lync users over a range of number of 100 possible numbers. I should find a way when the call is received from PSTN Gateway to release the call if the called is not a user lync .
Any solution ?