Silvia Pfeiffer said: "I doubt both of these statements about HTTP are true any longer." [BA] In fact, they haven't been true for quite a while. Every day users participate in interactive sessions over HTTP, largely in circumstances where use of UDP media is not possible. Because of the prevalence of highly restrictive enterprise firewalls that do not permit passing of UDP, the ability to support realtime communications over HTTP is now considered a practical requirement for business-oriented services, such as web conferencing. Although realtime communications over HTTP is largely used as a fallback, measurements show surprisingly high audio quality in the majority of sessions, probably because many sessions take place over well-provisioned enterprise networks.