You can set up Lync-to-phone to let your users make calls to and receive calls from the traditional telephone network by ...

You can set up Lync-to-phone to let your users make calls to and receive calls from the traditional telephone network by using Lync. Lync-to-phone requires that you set up an account with either a mobile phone carrier or a public switched telephone network (PSTN) carrier, depending on your Lync Online service plan.