\section{Network-Layer Priority and Preemption}

It may be desirable to provide reserved resources or a higher traffic
priority to emergency calls.  In RSVP, this is relatively
straightforward for the caller-operator direction if network operators
can authenticate emergency operators.  Similarly, marking packets
destined for the iPSAP with a higher-priority DS value in a diffserv
environment requires no additional protocol support and is a local
operational issue likely to be dealt with by national regulators.

