@inproceedings {GGS11,
  booktitle = {Tenth International Conference on Networks (ICN)}, 
  author    = {Gasterst{\"a}dt, Stefan and Gusowski, Markus and Schnor, Bettina}, 
  title     = {{SIP Providers' Awareness of Media Connectivity},} 
  address   = {St. Maarten, The Netherlands Antilles}, 
  year      = {2011}
}