The type of access and choice of service are managed on a per-user basis, rather than a per-site or per-access device basis.
The combination of PPP and Ethernet is known as Point-to-Point Protocol over Ethernet (PPPo E) and is defined in the Internet Engineering Task Force RFC 2516.
Because Ethernet is inherently a shared access technology, it provides no such facilities.
By combining the Point-to-Point Protocol (PPP) with Ethernet, an ISP can use Ethernet topologies and still maintain the individuality of user access as if they were using a dial-up modem.
Lync has been designed to work without Qo S but Lync Administrators can choose to enable both Lync endpoints as well as servers to mark Differentiated Services Code Point (DSCP) values on audio and video packets.