What are suspicious VoIP delays?

Wojciech Mazurczyk, Krzysztof Cabaj, Krzysztof Szczypiorski. What are suspicious VoIP delays?. Multimedia Tools Appl., 57(1):109-126, 2012. [doi]

@article{MazurczykCS12,
  title = {What are suspicious VoIP delays?},
  author = {Wojciech Mazurczyk and Krzysztof Cabaj and Krzysztof Szczypiorski},
  year = {2012},
  doi = {10.1007/s11042-010-0532-0},
  url = {http://dx.doi.org/10.1007/s11042-010-0532-0},
  researchr = {https://researchr.org/publication/MazurczykCS12},
  cites = {0},
  citedby = {0},
  journal = {Multimedia Tools Appl.},
  volume = {57},
  number = {1},
  pages = {109-126},
}