According to one example, a method includes processing a communication session with a first virtual machine of a plurality of virtual machines associated with a network node and monitoring packet loss on a leg of the communication session between a first endpoint and a second endpoint. The method further includes, in response to determining that the packet loss exceeds a first threshold, toggling on an enhanced mode for a codec associated with the communication session, the enhanced mode providing increased error resilience. The method further includes, in response to determining that the toggling on the enhanced mode causes the first virtual machine to exceed a processing capacity threshold, moving the communication session to a second virtual machine of the plurality of virtual machines.