zhengzhou yuxin is founded in 2000,and we have been exported the phone for more than ten years,.the voip phone is a new phone in the telecommunication and it will be the leader because of the best quality and low price .nowadays they are more popular in europe and america..the voip phone is widely used in the enterprises and the white collars .because they have to communicate with people and then they need to make calls .also,the voip phone is right for them.the charge you make phone is only 1/5 than the normal telephone.