Removed outdated citations.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