@inproceedings {GGS2011,
    author    = "{Stefan Gasterst\"adt and Markus Gusowski and Bettina Schnor}", 
    title     = "{SIP Providers' Awareness of Media Connectivity}", 
    booktitle = "{Tenth International Conference on Networks (ICN)}", 
    year      = "{2011}", 
    address   = "{St. Maarten, The Netherlands Antilles}" 
}