| Introduction
Key Features
How This Application Works
Component List
Introduction
The Cisco EGW 2200
permits DPNSS or QSIG PBXs to take advantage of
Cisco Unity's advanced messaging services by providing
the necessary signaling and feature interworking
between Cisco Unity and the DPNSS or QSIG PBX.
The Cisco EGW 2200
can support one or more Cisco Unity servers and
multiple TDM PBXs. The PBXs can be DPNSS or QSIG,
but not a mix.
A Cisco SIP Proxy
Server may be used between Cisco Unity and the
Cisco EGW 2200. In this case, you configure the
Cisco EGW interface to the proxy server instead
of to the Cisco Unity server; the proxy server
is then configured to manage one or more Cisco
Unity servers.
There are two generic
architectures to be considered when attaching
the Cisco Unity to TDM-based networks:
- Cisco Unity only attachment
to a DPNSS or QSIG-based PBX network, shown
in Figure 1
- Cisco Unity and Cisco CallManager
integration in a DPNSS or QSIG-based network,
shown in Figure 2
Figure 1 depicts the generic
architecture for Cisco Unity only attachment to
a DPNSS or QSIG-based network. The DPNSS or QSIG
PBX interfaces with the IP network through one
of the supported access routers (Cisco 2600, 3600,
or 3700 class). The access router provides the
PBX the physical E1 interface(s) to the IP network,
voice packetization, call control through the
Cisco EGW 2200 using MGCP and DPNSS or QSIG signaling
backhaul over IP from the PBX to the Cisco EGW
2200 and vice versa.
Figure 2 shows a high-level
architecture of Cisco Unity and Cisco CallManager
integration in a DPNSS or QSIG-based network.
As in the previous example, the DPNSS or QSIG
PBX interfaces with the IP network through one
of the supported access routers (Cisco 2600 or
3700 class). The access router provides the PBX
a physical E1 interface to the IP network, voice
packetization, call control through the Cisco
EGW 2200 using MGCP and DPNSS or QSIG signaling
backhaul over IP from the PBX to the Cisco EGW
2200 and vice versa.
The Cisco EGW 2200 performs
the following functions:
- DPNSS or QSIG to SIP
signaling interworking
- Call control across
the IP network
- Feature interworking
such as Message Waiting Indicator
- Centralized policy-based
call routing and dial plan management if required
- Access to advanced
voice messaging features such as Auto Attendant
When integrated into
a QSIG-based PBX network, it is expected that
Cisco CallManager will interface with the QSIG
PBX(s) through the QSIG interface on Cisco CallManager.
The Unity platform will interoperate with Cisco
CallManager using Skinny Client Control Protocol
(SCCP). In this scenario, the Cisco EGW 2200 plays
no role in signaling interworking between Cisco
CallManager and Cisco Unity.
Figure 1. Cisco Unity Messaging
Application
For more information on a component in the illustration,
point to it. To go to a detailed description,
click on it. Click a connector line for information
on the interfaces and connections between components.
|
Planning 
Cisco Unity Messaging 
