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How Do I? Part 1 IP Connectivity - Page 85
LAN
When using an indirectly connected WAN or VPN router these devices should be
capable of handling marked traffic at a priority to ensure prompt handling of voice
traffic. Alternatively, over supplying the available bandwidth will ensure that all
packets, voice and data, are handled quickly.
The VPN Line should be used to set the maximum number of simultaneous voice
call and the System/Gatekeeper tab (see page 37) should be used to specify the
DSCP (TOS or Diffserv) value for the VoIP traffic type.
See Configure VPN Line on page 99 and QoS over WAN between IPNC & 3rd
Party Router on page 88 for details.
LAN – with VPN ROUTERS
This application example is suitable for VoIP between Site 1 and Site 2. All inter-
site traffic is handled and routed by the VPN router. When using an indirectly
connected slow speed link, all routers should be capable of handling marked
traffic at a priority to ensure prompt handling of voice traffic.
Voice packets transmitted by the IPNC have the DSCP field marked to indicate
it's priority (Diffserv).
INDeX 2
INDeX 1
192.168.42.1
Site 2
Site 1
192.168.42.10
192.168.124.1
V
PN
Router#1
V
PN
Router#2
PC_1
PC_2
192.168.124.19
192.168.124.100
192.168.42.100
Task Description
Step 1
Configure PC_1 and PC_2 networking
as shown
Site 1
• IP Address = 192.168.42.10
• IP Mask = 255.255.255.0
• Gateway = 192.168.42.100
Site 2
• IP Address = 192.168.124.19
• IP Mask = 255.255.255.0
• Gateway = 192.168.124.100
The IPNC will always present itself as the default router when
allocating IP parameters via the DHCP. For this reason the
DHCP server option should not be used as the IPNC is not
the default router for the networks in this application example.
INDeX IPNC Cassette Administration Manual How Do I? - Page 85
38DHB0002UKDD – Issue 7 (22/11/02) Part 1 IP Connectivity