my hp laptop when i connected to modem it worked properly but when i call to someone audio is not working properly

Solution
Need more details here, call to someone how? What exactly is "not working properly", what is working and what is not working? What laptop model, what are you using for audio? What "modem" are you talking about, are you using dial-up or broadband? Dial-up may not have the speed needed to use VOIP.
Need more details here, call to someone how? What exactly is "not working properly", what is working and what is not working? What laptop model, what are you using for audio? What "modem" are you talking about, are you using dial-up or broadband? Dial-up may not have the speed needed to use VOIP.
 
Solution