Consider the following scenario:
- You enable the Collocated Mediation Server option in a Microsoft Lync Server 2010 Front End Server pool in a Lync Server 2010 environment.
- You deploy a Front End Server in the Lync Server 2010 Front End Server pool.
- You enable the Limit service usage to selected IP address option, and then you configure the Primary IP address and the PSTN IP address of the Front End Server.
- You register the Primary IP address on the DNS server. However, you do not register the PSTN IP address on the DNS server.
- You deploy the Mobility service in the environment.