Configuring Hybrid Voice
With Office 365 Lync Online, Microsoft offers customers Lync Server 2013 as an online service. Customers can migrate to Lync Online on their own terms. With an existing deployment of Lync Server on-premises, hybrid voice refers to a customer environment where some users are enabled for Enterprise Voice on-premises (that is, on-premises users) and other users are enabled for hosted Enterprise Voice online (that is, Office 365 users). This hybrid model provides a seamless user experience for users enabled for Enterprise Voice, whether they are enabled on-premises or online. This section guides you through the configuration of Enterprise Voice with Lync Online.
This section assumes that you have already deployed Lync Server on-premises and have enabled users for Enterprise Voice. You have defined at least one gateway peer to provide PSTN connectivity.
This section also assumes that you have configured on-premises Active Directory Federation Services—a Windows Server 2008 service—to federate with the Microsoft Federation Gateway. After Active Directory Federation Services is configured, all Lync Online users whose identities are based on the federated domain can use their existing corporate logon to automatically authenticate to Office 365.