Specifications

HiPath 3000/5000 in the LAN Network For internal use only
P31003-H3560-X100-1-7618, 09/05
4-16 HiPath 3000/5000 V6.0, System Description
3000sb4.fm
HG 1500 V3.0
4.5.1 Protocols
This section contains an overview of H.323 standards regarding signaling and media protocol
that are relevant to HG 1500 V3.0.
H.225.0 Q.931 Call Setup
This protocol defines signaling between two endpoints for call setup and cleardown.
H.225.0 RAS Control
RAS (Registration, Admission and Status) defines signaling between client and gatekeeper for
detection and registration purposes.
H.245 Signaling
This protocol defines the declaration of capabilities and exchange of control messages be-
tween endpoints. It is used for specifying channel usage and functions.
H.323
This is a standard for packet-oriented multimedia communication systems and was developed
by the ITU (International Telecommunication Union. HG 1500 V3.0 uses H.323 V4.0 but can
also communicate with earlier versions of the H.323 protocol (backward compatibility is guar-
anteed).
Fast Connect (fast start) is supported. The Fast Connect feature lets HG 1500 V3.0 set up a
multimedia channel without waiting for an H.245 connection.
RTP and RTCP
RTP (Real-time Transport Protocol) manages the transfer of real-time packets from an end-
point to one or more endpoints.
A header containing a time stamp and a sequence number is added to every UDP packet. With
appropriate buffering at the receiving station, timing and sequence information enables the ap-
plication to:
● eliminate double packets,
● rearrange nonsequential packets,
● synchronize data,
● achieve continuous playback despite varying latencies.