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7.6 Troubleshooting
- I try to call someone,
but fail to establish a connection.
- 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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