@misc{1194921,
  author = {Leslie A Collica and Leslie A Collica and Dawn M Hoffman},
  title = {ISDN conformance testing guidelines:},
  year = {1994},
  month = {1994-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.823-6},
  language = {en},
}