The high water mark limits outstanding incoming messages (Invite, page mode messages, in-dialog messages, etc) that are maintained in internal queue including thread pool queue and not seen by the application yet. If the current number of outstanding incoming messsages is higher than this value, new incoming messages are automatically rejected until the value goes under the lower water mark. To reduce the value below the current lower water mark, the lower water mark value shoudl be changed first. By default, this value is int.MaxValue. If both low and hight water mark values are int.MaxValue, water mark checks are disabled.

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