IP-callback connect two any telephones all over the world at low price. You do not need additional equipment and the call does not influence on the quality of your Internet channel.Your unfavourable comments will not help us to improve application. If you have any questions or wishes you can write it on our forum https://www.comtube.com/forum/More detailed information about our services and tariffs you see on www.comtube.comKeywords: call comtube telephone sip voip