[reSIProcate] [patch] possible DoS with REFER Event: header

[Robert Szokovacs]

Hi,

When DUM receives a REFER with and "Event:" header, it will use the value 
provided by the client (see BaseSubscription.cxx:22), and later it will cause 
an assert() in ServerSubscription.cxx:208.
The attached patch fixes this and reject such request with 489.

br

Szo
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