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How Do I? Part 2 Voice Over IP - Page 99
Step 5 - Configure VPN Line
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.
VoIP Gateway Options
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.
Silence Suppression
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 support
Fax is supported (the configuration for FoIP transport).
Compression Types
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 control
VPN Line is used to control the amount of concurrent calls that are allowed to
occupy the link (see page 41).
VPN line Configuration
In order to demonstrate how the VPN line is used for call routing and control a
simple VoIP example is shown below:
IP Network 1
Site 1 (Node 6002)
IP Link
LAN IP Address
192.168.200.10/24
Gateway 1
SoftPhone
(Extn 4321)
Extn 2000 - 2100
IP Network 2
Unit 2
LAN IP Address
192.168.50.1/24
Gateway 2
Site 1 (Node 6003)
Extn 3000 - 3100
INDeX and IPNC
(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