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NAT Traversal Options
Enable this option only if you find yourself in a private network behind a firewall
and if you do not use a SIP provider to route your calls. Select the check box and
enter the IP address of the firewall machine in dot notation, for example,
192.168.34.166.
RTP Properties
Linphone uses the real-time transport protocol (RTP) to transmit the audio data of
your calls. The port for RTP is set to 7078 and should not be modified, unless you
have another application using this port. The jitter compensation parameter is used
to control the number of audio packages Linphone buffers before actually playing
them. By increasing this parameter, you improve the quality of transmission. The
more packages buffered, the greater a chance for "late comers" to be played back.
On the other hand increasing the number of buffered packages also increases the
latency—you hear the voice of your counterpart with a certain delay. When
changing this parameter, carefully balance these two factors.
Other
If you use a combination of VoIP and landline telephony, you might want to use
the dual tone multiplexed frequency (DTMF) technology to trigger certain actions,
like a remote check of your voice mail just by punching certain keys. Linphone
supports two protocols for DTMF transmission, SIP INFO and RTP rfc2833. If
you need DTMF functionality in Linphone, choose a SIP provider that supports
one of these protocols. For a comprehensive list of VoIP providers, refer to
tion 8.8, "For More Information"
8.1.4 Configuring the Sound Device
Once your sound card has been properly detected by Linux, Linphone automatically
uses the detected device as the default sound device. Leave the value of Use sound device
as it is. Use Recording source to determine which recording source should be used. In
most cases, this would be a microphone (micro). To select a custom ring sound, use
Browse to choose one and test your choice using Listen. Click Apply to accept your
changes.
8.1.5 Configuring the SIP Options
The SIP dialog contains all SIP configuration settings.
158
KDE User Guide
(page 165).
Sec-
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