Configuration Examples - Page 53
Part 3 VoIP Configuration
Once a VPN connection is established and working, VoIP configuration can be applied.
For this reason it is important to have full IP connectivity before beginning VoIP
configuration.
Because the VoIP configuration is transparent to the means of IP connectivity, the
configuration procedure described here can be applied to any of the examples shown in
earlier sections (see pages 34 and 37). However, for the sake of clarity, the following
example is specific to the IP Office to IP Office via Logical LAN example shown on
page 37.
On completion of the steps detailed in the table below it will be possible make calls
between Site A and Site B using the IP hard phones, the IP soft phones and the on-
switch phones.
Task Description
Step 1
Check that the IPSec Tunnel is established
between the two systems (see page 37).
Before beginning the VoIP configurations of
this example it must be possible to perform the
following tasks:
Ping between the Internal LANs (through the
established IPSec tunnel).
Ping the remote internal system IP address and
confirm that the resulting packet exchanges are
shown using the SysMonitor/Interface decode
options.
Do not proceed until all tests are successful.
Step 2
Within Manager, for Office A create an IP
Line and apply the following parameters.
Using the Line tab of the IP Line form:
•
Line Number = 2
•
OutGoing Group ID = 2
The IP Line is used to configure the VoIP
Gateway for IP Office.
IP Line number provides a discriminator to
other line groups. No two line groups can share
the same line number
The Line Group ID as an absolute reference to
a IP Line. It is permissible for 2 IP Lines to
share the same Line ID in the case where
redundancy is required. The IP Line number
cannot exceed 240.
Step 3
Within Manager, for IP Office B create an IP
Line and apply the following parameters.
Using the Line tab of the IP Line form:
•
Line Number = 3
•
OutGoing Group ID = 3
Step 4
For IP Office A and IP Office B, apply the
bandwidth restrictions using the Line tab of
the IP Line forms.
•
Number of Channels = 5
•
Outgoing Channels = 5
•
Voice Channels =5
•
Data Channels = 5
This must be done on
both
IP Office A and
IP Office B
Under the IP Office (3.0+) implementation, the
maximum bandwidth that can be used for
IPSec encrypted VoIP calls is limited to either
512 (IP412) or 256Kbps (SMO, IP401, IP403,
IP406). This is enough to allow up to five G729
calls.
As the total bandwidth between the two xDSL
lines is 512Kbps this will allow for 256Kbps
(50%) for non-voice traffic between the two
locations
IP Office (R3.0) Virtual Private Networking
Configuration Examples - Page 53
40DHB0002UKER Issue 3 (4th February 2005)
Part 3 VoIP Configuration
