The LyncDiscover service requires a static DNS entry that is dedicated to this service. The DNS requirements for Lync mobile are given in Table 24.2.
The LyncDiscover service will be used by Mobile devices and Lync 2013 desktop clients. To properly support devices that are connected to either the internal corporate network or a public network, both the LyncDiscoverinternal and the LyncDiscover records must be created, and must point to the appropriate IP addresses.