One of the many interesting things we’ve added to OCS R2 is the idea of resiliency. In OCS RTM version when you were in an active call if your client lost connectivity to the Front-end server your call was terminated. In OCS R2 we don’t tear down the call if active. Some call-control is obviously not available until connectivity re-established but the call goes on.
Some other great aspects were adding typing suppression so that typing during a call would not sound loud and improvement of “comfort noise”which reduces hisses and smoothes over discontinuous flow of packets in the call, as well as echo suppression to reduce echoes on call setup.