New Hybrid Voice Features
Hybrid voice enables customers to leverage the on-premises Enterprise Voice environment for Lync Online users as if they were on-premises Enterprise Voice users. The primary feature of a hybrid voice environment is that Lync Online users can place and receive calls from the on-premises gateway. Other important features are:
Media bypass
E9-1-1
These features require the tenant administrator to configure on-premises Lync settings onto Office 365.
Media bypass
Media bypass works the same way for Lync Online users as it does for on-premises users. Lync Online PSTN calls are bypassed whenever possible. This is so that the media traffic does not traverse the Lync Online data centers wherever possible.
E9-1-1
Enhanced 9-1-1 works the same way for Lync Online users as it does for on-premises users. The location information and policy of Lync Online users are automatically retrieved and transmitted during an emergency call.