This issue occurs after you install November 2016 cumulative update in a Microsoft Lync Server 2013 environment.
To fix this issue, install the January 2017 cumulative update 5.0.8308.984 for Lync Server 2013, Web Components Server.
Emergency call (E9-1-1) fails in Lync Server 2013
Applies To
Lync Server 2013
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