This is another reason these text style protocols are poorly designed. In addition to ending up ambiguous in practice, in addition to not being standard because of &quot;liberal implementations&quot;, we get this terrible performance to boot.<p>SIP has the same issue. Though most VoIP companies don&#x27;t have much bandwidth and you can just saturate them. But if they manage to filter that, overloading the actual system is not a difficult task.