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Removed outdated citations.

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Achim D. Brucker 2017-01-04 14:44:15 +00:00
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StatefulFW/VOIP.thy
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@ -47,9 +47,8 @@ text{*
complicated example, namely Voice over IP (VoIP). VoIP is complicated example, namely Voice over IP (VoIP). VoIP is
standardized by the ITU-T under the name H.323, which can be seen as standardized by the ITU-T under the name H.323, which can be seen as
an "umbrella standard" which aggregates standards for multimedia an "umbrella standard" which aggregates standards for multimedia
conferencing over packet-based networks (for a good overview of the conferencing over packet-based networks. H.323 poses many problems
protocol suite, see \cite{switch_basic}). H.323 poses many problems to firewalls. These problems include:
to firewalls. These problems include (taken from~\cite{vtel}):
\begin{itemize} \begin{itemize}
\item An H.323 call is made up of many different simultaneous \item An H.323 call is made up of many different simultaneous
connections. connections.
@ -60,8 +59,7 @@ text{*
\end{itemize} \end{itemize}
Again we only consider a simplified VoIP scenario with the following Again we only consider a simplified VoIP scenario with the following
seven messages which are grouped into four subprotocols (see Figure seven messages which are grouped into four subprotocols:
\ref{voip}):
\begin{itemize} \begin{itemize}
\item Registration and Admission (H.225, port 1719): The caller \item Registration and Admission (H.225, port 1719): The caller
contacts its gatekeeper with a call request. The gatekeeper contacts its gatekeeper with a call request. The gatekeeper