Internet Protocol Direct Dial Inward Configuration File (Ipddi.fil) And Voice Over Internet Protocol (Voip) - Avaya CS7000 Administrator's Manual

Chapter 4: Configuring the Avaya Conference Management Server (CMS)
Internet protocol direct dial inward configuration file
(IPDDI.fil) and Voice Over Internet Protocol (VoIP)
Avaya have added a voice over Internet Protocol (VoIP) interface to the CS7000 conferencing
platform. The CS7000 supports mixed public switched telephone network (PSTN) and VoIP
callers in conferences. The CS7000 ensures that the user experience is transparent,
irrespective of the transport method.
The principle is that all traffic occurs within the same CS7000 conferencing infrastructure as the
PSTN traffic. The user experience, the Operator experience, and elements such as billing and
reporting remain essentially unchanged.
For more information on VoIP, see the Avaya CS7000 Conferencing Server Hardware Guide.
On the VoIP card, Data Connections Ltd (DCL) supply a serial interface protocol (SIP) stack,
version 2.04. It is responsible for call setup. The SIP communications take place over user
datagram protocol (UDP). Once call setup is established, the actual voice traffic is transported
using real time transport protocol (RTP) over UDP. SIP uses UDP port 5060 for call setup.
At the core of the system, routing decisions are made based on direct dial inward (DDI).
Accordingly, SIP and IP addresses for inbound traffic are mapped to DDIs to provide the correct
user experience based on the conference booking. The configuration file is called Ipddi.fil.
The IPDDI menu option helps you to view the IPDDI table on the CMS Management interface.
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CS7000 System Administrator Guide for Release 9.4 January 2006