Detailed Product Description 1) Perfectly support Skype, VoipButser, VoipStunt, VoIPCheap, VoipDiscount, SparVoip, Internetcalls, poivY, ... VOIP software, time and user ID, the product can support multiple languages, calls records checking, calls history and ... ringing, various classical polyphonic ringtones, effectively eliminating echoes, speaker volume can be adjusted in calling at will; hands-free ...