ISDN Q.921-User Adaptation Layer. - Ken Morneault; Selvam Rengasami; Malleswar Kalla; Greg Sidebottom (RFC, 2001)

Integrated Services Digital Network (ISDN) Q.921-User Adaptation Layer. - Ken Morneault; Selvam Rengasami; Malleswar Kalla; Greg Sidebottom (RFC, 2006)