%0 Journal Article
%K Critical Infrastructure
%K PBX
%K PBX security
%K PSTN
%K Telephony
%B Information & Security: An International Journal
%D 2012
%G eng
%N 1
%P 89-97
%R http://dx.doi.org/10.11610/isij.2807
%T PRETTY (Private Telephony Security) - Securing the Private Telephony Infrastructure
%V 28
%8 2012