TY - GEN AU - David Kuhn C2 - ITL Bulletin, National Institute of Standards and Technology, Gaithersburg, MD DA - 2000-08-01 LA - en PB - ITL Bulletin, National Institute of Standards and Technology, Gaithersburg, MD PY - 2000 TI - Security for Private Branch Exchange Systems UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=151230 ER -