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SIP traffic from Skype for Bussiness Front-End and\or Edge servers(depending on the configuration) is being inspected if a cached policy is already applied to it. If
Check if there is no corresponding cache it a preexisting calculation
the traffic is being redirected to the Maintenance service on the Admin Portal If there is no pre-existing cache.
The Maintenance Service calculates and caches the rules for future calculations and returns the policy back to the SIP Filter
SIP filter cache the policy locally and enforce the calculated policy.
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It is recommended to maintain this mode during a fresh deployment in order to establish a comprehensive enough cache as .
This is due to the introduced load of calculating policies without preexisting cache can hinder the normal Skype for Bussiness operation and generate instabilities.
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