Most customers require a strict traffic segregation and inspection on all traffic coming from and going to the Internet. This traffic must be fully inspected, at least on IP Layer 7. The ISO model describes Layer 7 as the IP application layer, which in our case is HTTP/HTTPS and SIP. In a Unified Communication solution – this is not enough.

Web traffic may be easier to analyse based on Reverse Proxy technologies, but how can SIP traffic be analysed? How can compliance of the policies (which are assigned to the users) be ensured?

Lync is a very sensitive communication system which operates with real time data. Real time data is time sensitive and session-aware. Web traffic also has its own uniqueness. In Lync there are web session tickets which must be kept intact. For example, these tickets ensures that the external client will receive the correct buddy list and not anything from another user.