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8.6 Troubleshooting
- I try to call someone, but fail to establish a connection.
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There are several reasons why a call could fail:
- Your connection to the Internet is broken.
-
Because Liphone uses the Internet to relay your
calls, make sure that your computer is properly
connected to and configured for the Internet. This can
easily be tested by trying to view a Web page using
your browser. If the Internet connection works, the
other party might not be reachable.
- The person you are calling is not reachable.
-
If the other party refused your call, you would
not be connected. If Linphone is not running on the
other party's machine while you are calling, you will
not be connected. If the other party's Internet
connection is broken, you cannot make the connection.
- My call seems to connect, but I cannot hear anything.
-
First, make sure that your sound device is properly
configured. Do this by launching any other application using
sound output, such as a media player. Make sure that
Linphone has sufficient permissions to open this device.
Close all other programs using the sound device to avoid
resource conflicts.
If the above checks were successful, but you still fail
to hear anything, raise the recording and playback levels
under the tab.
- The voice output on both ends sounds strangely clipped.
-
Try to adjust the jitter buffer using in to compensate for delayed voice packages. When
doing this, be aware that it increases the latency.
- DTMF does not work.
-
You tried to check your voice mail using the DTMF pad,
but the connection could not be established. There are three
different protocols used for the transmission of DTMF data,
but only two of these are supported by Linphone (SIP INFO
and RTP rfc2833). Check with your provider whether it
supports one of these. The default protocol used by Linphone
is rfc2833, but if that fails you can set the protocol to
SIP INFO in . If it does not work with either of them, DTMF
transmission cannot be done using Linphone.
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