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How Do I? 

Part 1 IP Connectivity - Page 87 

The configuration outline below provides the VoIP connectivity for an extended 
Ethernet LAN operating at 10/100Mbs. This application does not provide any 
connectivity for non-voice traffic. The IPNC is deployed purely to facilitate VoIP 
operation between the two INDeX systems. The configuration is ideal for INDeX 
to INDeX VoIP telephony testing. 

INDeX 2 

INDeX 1 

192.168.42.1 

192.168.42.2 

192.168.42.201 

192.168.42.3 

 

Notes:  1.  Both INDeX systems are connected to the LAN via the LAN interface 

an there are no routers between the two systems. 

 

2.  INDeX 1 System will allocate VoIP parameters. There are no other 

DHCP servers on the network 

 

3.  The IPNC VoIP Gateway function resides solely on the 

LAN1interface. The IPNC listens for VoIP Gateway connection on the 
LAN1 interface IP address only. This does not preclude the use of 
LAN2 interface for the VoIP transmission. An appropriate routing 
entry, on both IPNCs, would be required to allow the IPNC to route 
via LAN2 and access the LAN1 subnet of the partnering INDeX (a 
similar method is used in the next example). 
 

 

Step 1 
Obtain the configuration file for INDeX 1 
and perform the following tasks: 

•  Unique System Name 
•  Assign the appropriate IP address 

to the LAN1 interface. 

 
Using the configured mask and IP address the IPNC is 
able to derive the network address of the interface. It is 
not necessary to add a routing entry in support of the 
configured LAN1 or LAN2 network address. 
See The System Configuration Menu on page 32. 

Step 2 
Obtain configuration file for INDeX 2 and 
perform the following tasks. 

•  Unique System Name 

•  Assign the appropriate IP address 

to the LAN interface 

•  Disable the DHCP Server 

 

 
Notice that the IP address for INDeX 2 IPNC falls outside 
the IPNC default DHCP scope (200). 
The DHCP server must be disabled on this unit so as not 
to conflict with the DHCP server configured in the 
previous step of INDeX 1. 
See The System Configuration Menu on page 32. 

Step 3 
Test Connection 
 

 
A common mistake with this configuration is to assign IP 
addresses to INDeX 1 and INDeX 2 such that they reside 
on different subnets. 
The IPNC is configured correctly if both INDeX1 and 
INDeX 2 respond to a PING for the PC attached to LAN. 

 

Note:  The IPNC setup for 'Remote Terminal Users' is identical to that given for VoIP trunking in the 

example above, except that the numbers used will be for 'Reserved Number' (default 18) for the 
required number of terminals. Refer to the INDeX Programming Manual for details. 

INDeX IPNC Cassette Administration Manual 

How Do I? - Page 87 

38DHB0002UKDD – Issue 7 (22/11/02) 

Part 1 IP Connectivity