Avaya 38DHB0002UKDD Manuel D’Utilisation

How Do I? 

Part 2 Voice Over IP - Page 99 

The VPN Line Group ID is an absolute reference to VPN line. It is permissible for 
2 VPN lines to share the same Line ID in case where redundancy is required. 

Call Routing - When an extension number dialled from one INDeX to another, the 
transmitted number is prefixed with the node number of the other INDeX. The 
VPN number is sent to the IPNC cassette via the trunk group containing the IPNC 
channels. The IPNC acts on the VPN number matched in its Shortcodes. 

Further Bandwidth can be saved by enabling silence suppression on the link. 
This can reduce the required bandwidth by over 50% during period of silence but 
carries a QoS penalty in that the conversation can feel unnatural. 

Fax is supported (the configuration for FoIP transport). 

The Following Compression types are supported 

G711 – Offer the best quality speech but uses the highest bandwidth. G711 
should be used on LAN or WAN links were bandwidth availability is not an issue. 

G729 and 723 Ultra low voice compression allows optimum use of slow speed 
WAN links. 

VPN Line is used to control the amount of concurrent calls that are allowed to 
occupy the link (see page 41). 

In order to demonstrate how the VPN line is used for call routing and control a 
simple VoIP example is shown below: 

LAN IP Address 
192.168.200.10/24 

Gateway 1

SoftPhone 
(Extn 4321) 

Extn 2000 - 2100 

LAN IP Address 
192.168.50.1/24 

Gateway 2 

Extn 3000 - 3100

(emulating DPNSS)

INDeX and IPNC 

 

INDeX IPNC Cassette Administration Manual 

How Do I? - Page 99 

38DHB0002UKDD – Issue 7 (22/11/02) 

Part 2 Voice Over IP