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Evolution from circuit-switched to IP
There are three stages to upgrading from a DEFINITY G3r to an Avaya Communication
Manager IP PBX:
1. Replace the G3r processor with industry-standard S8700 servers.
2. Add IP circuit packs (C-LAN and MedPro) to support IP endpoints.
3. Consolidate multiple systems into a single system to simplify administration. Support
network or processor failure conditions with LSPs deployed at remote sites.
Steps 1 and 2 can be reversed. The next five diagrams show the migration from circuit-switched
DEFINITY to an IP-enabled S8700 Multi-Connect system with server consolidation and LSP
survivability at a remote site.
Migration from DEFINITY
Server R to S8700 Multi-Connect
Phase 1: Processor replacement
This section explains how an existing non-IP Avaya Communication Manager PBX can evolve
to an IP Telephony-based solution. We will examine the case of an existing system that is based
on the traditional PPN/EPN architecture, which will be applicable to all the G3 platforms.
When designing S8700 Multi-Connect systems, the call control network must be a nonrouted
private network that is disconnected from the internal IP network of the enterprise. The
equipment for this private network is provided as part of the S8700 Multi-Connect solution. See
Voice quality network requirements
support IP Telephony.
The S8700 Media Server controls Media Gateways in a different manner than DEFINITY
controlled Port Networks. With DEFINITY, the control path signaling shared the same transport
media as the bearer channels. In a Multi-Connect system, call control signaling is established
from the S8700 Media Server over an Ethernet connection to the TN 2312 IP Server Interface
(IPSI) in the IPSI-connected Media Gateway. Non-IPSI connected Port Networks get their
control information from the servers through the Center Stage Switch to one of the Port
Networks that does contain an IPSI. An IPSI can support up to five Port Networks.
The full migration from a G3r to an S8700 server Multi-Connect system, with traditional or ATM
center stage, involves the following simplified steps:
1. Decide which EPNs are to be IPSI connected, and replace processor complexes with IPSIs.
2. Install servers.
3. Install Ethernet switches.
86 Avaya Application Solutions IP Telephony Deployment Guide
for more information on setting up an IP network that can
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