1-2
Cisco H.323 Signaling Interface User Guide
OL-4806-01 Rev. A14
Chapter 1 Cisco H.323 Signaling Interface Overview
Cisco HSI System Description
Figure 1-1
Cisco HSI System Overview
PGW 2200
The PGW 2200 consists of the hardware and software that perform the signaling and call control tasks
(such as digit analysis, routing, and circuit selection) and seamlessly switch calls from the PSTN through
to the IP network.
IP Network
The purpose of the Cisco HSI is to enable the PGW 2200 to interoperate with the H.323 network.
Cisco HSI System Description
The Cisco HSI system has two subsystems
(see
Figure 1-2
)
:
•
Operations, Administration, and Maintenance (OAM) subsystem
•
Call control subsystem
Callers
Cisco PGW 2200
Operational
support systems
H.323 signaling
interface
System
technician
System
operator
System
administrator
Voice
IP
network
Callers
Voice/
signaling
69717
Voice/
signaling
Access
network
E-ISUP/
RUDP
H.323