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P31003-H3550-S403-4-7620, 02/05
HiPath 3000 V5.0, HiPath 5000 V5.0, Service Manual
10-39
Workpoint Clients
IP Telephony (Voice over IP)
The division of HG 1500 resources into signaling and payload resources is a key feature in
version 5.0.
● Signaling Resources
These include all of the node-specific signaling data required for Voice over IP for IP-sup-
ported (LAN, Intranet, Internet) and circuit-switched networks (ISDN, PSTN). These re-
sources are provided centrally by a single HG 1500 board, the signaling gateway (= gate-
keeper HG 1500). The number of HG 1500 boards of the node is irrelevant. A HG 1500
board is defined as HG 1500 gatekeeper using HiPath 3000 Manager E.
● Payload Resources
The node resources required for the gateway transfer (between IP-supported and circuit-
switched networks) of VoIP voice data (payload) are provided by the media gateways (=
gateway HG 1500). This can be one or more HG 1500 board(s).
No payload resources are required for direct transfer between IP-supported networks. A
HiPath 5000 with HiPath ComScendo Service can function as the VoIP system.
In systems with just one HG 1500 board, this board functions both as a signaling gateway and
a media gateway. A "Release gateway resources" flag must be activated for this in HiPath 3000
Manager E. Otherwise no resources can be assigned.
In systems with multiple HG 1500 boards, the payload resources are controlled by the central
node Resource Manager. This is a self-configuring service. The signaling resources are pro-
vided centrally by the first HG 1500 board. This signaling gateway also accesses other media
gateway resources (CODECs, B channels) and signaling data (for example RTP, RTCP). This
gives IP workpoint clients and other gateways access to central payload resources of all
HG 1500 boards in a node.
Resources for functions which are not based on H.323 (for example, routing channels, vCAPI
channels), are provided as before by each HG 1500 board. In systems with multiple HG 1500
boards, the resources are provided solely by the media gateways for performance reasons.
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