User Manual

BROWAN COMMUNICATIONS Page 137
including LANs, WANs, and the Internet. It was first
defined by the ITU in 1996 and has been updated
regularly.
The scope of H.323 covers real-time voice, video,
and data communication over packet-switched
networks. It was designed from the outset to
operate over IP networks, primarily, though H.323
may also operate over other packet-switched
networks. It was designed with multipoint voice and
video conferencing capabilities, though most users
do not take advantage of the multipoint capabilities
specified in the protocol.
15. L2TP
L2TP, Layer 2 Tunneling Protocol, is used to
provide IP security at the network layer.
L2TP uses UDP to transport the PPP data; this is
often encapsulated in IPSec for encryption instead
of using MPP.
16. PPTP
PPP (Point-to-Point Protocol) is a standard for
transporting datagram over point-to-point links. It is