... business man on trip,support PC-PC,PC-Phone,etc Cheap pric USB VOIP Phone with flash memeory, can read/write phonebook ... * Support the calling between PC-to-PC and PC-to-Phone* Echo cancellation,noise reduction,full duplex communication* Incoming/outgoing call ... sound card required;* Comfortable operation panel,similar as mobile phone . Ideal Present: Small USB VOIP Phone, auto-run on PC without driver