Cables4PC USB Skype VoIP to RJ11 Cordless Phone Adapter This very handy device allows you to use ANY phone of your choice with SKYPE.You can use a CORDLESS phoneor any other phone you wish. Use the k2VOIP USB to RJ-11 Phone Adapter to connect your existing phone to the Skype (or other) VOIP networks. k2VOIP is one of the leading US-based retailers of VOIP products and services.