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To answer the fundamental question of whether your proxy will keep any sort
of state -- session related, subscription related, or otherwise -- you need to
first determine whether it's necessary to do so for the proxy's purpose.
If what your proxy does requires and cannot operate without such state,
then you keep it. If the purpose doesn't require such state, then keeping it
ties up unnecessary resources, takes additional processing, creates more code to
debug and maintain, and makes the network less resilient -- in other words,
it would be foolish to maintain any more state than is absolutely necessary to
accomplish the task for which the proxy has been defined.
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- [Sip-implementors] Proxy call state for SUBSCRIBE Udaya Shankara
