Novell LINUX ENTERPRISE DESKTOP 10 SP1 - GNOME 23-05-2007, Manual

Page: 163 / 280

Using Voice over Internet Protocol 163
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Authentication Information
To register at a remote SIP server, provide certain authentication data, such as a password and
username. Linphone stores this data once provided. To discard this data for security reasons,
click
Clear all stored authentication data .
The Remote services list can be filled with several addresses of remote SIP proxies or service
providers.
Adding a SIP Proxy and Registering at a Remote SIP Server
1
Choose a suitable SIP provider and create a user account there.
2 Start Linphone.
3 Go to Go > Preferences > SIP .
4 Click Add proxy/registrar to open a registration form.
5
Fill in the appropriate values for Registration Period , SIP Identity , SIP Proxy and Route . If
working from behind a firewall, always select Send registration and enter an appropriate value
for Registration Period . This resends the original registration data after a given time to keep the
firewall open at the ports needed by Linphone. Otherwise, these ports would automatically be
closed if the firewall did not receive any more packages of this type. Resending the registration
data is also needed to keep the SIP server informed about the current status of the connection
and the location of the caller. For
SIP identity , enter the SIP URL that should be used for local
calls. To use this server also as a SIP proxy, enter the same data for SIP Proxy . Finally, add an
optional route, if needed, and leave the dialog with OK .
Configuring the Audio Codecs
Linphone supports a several codecs for the transmission of voice data. Set your connection type and
choose your preferred codecs from the list window. Codecs not suitable for your current connection
type are red and cannot be selected.
7.2.2 Testing Linphone
Check your Linphone configuration using
sipomatic
, a small test program that can answer calls
made from Linphone.
Testing a Linphone Setup
1 Open a terminal.
2 Enter
sipomatic
at the command line prompt.
3 Start Linphone.
4 Enter
sip:robot@127.0.0.1:5064
as SIP address and click Call or Answer .
5 If Linphone is configured correctly, you will hear a phone ringing and, after a short while, you
will hear a short announcement.
If you successfully completed this procedure, you can be sure that your audio setup and the network
setup are working. If this test fails, check whether your sound device is correctly configured and
whether the playback level is set to a reasonable value. If you still fail to hear anything, check the
network setup including the port numbers for SIP and RTP. If any other application or protocol uses
the defaults ports for these as proposed by Linphone, consider changing ports and retry.