But the 'audio codec' essbebe mentioned,
where I can check or select proper codec?
For Yahoo Messenger Audio this codec is recommended.
DSP Group TrueSpeech(TM) Audio CODEC
usually listed in Device Manager.
2.
What is your OS ? Xp or Vista /
Upgrade to latest version .
Yahoo! Messenger 9.0.
ver. 9.0.0.2162
Will check again YMessenger. later tonight .
rarely used now.
changed to SKYPE and Vonage VOIP. .
Stop gap remedy;
1.If you can
try to enter Opendns both in the modem
and network settings.
208.67.220.220 & 208.67.222.222.
3. download this application and check whether
the list contains the codecs.
http://www.zhangduo.com/unknowndeviceidentifier.html