- Random Drop Charging Action - The random drop charging action is added as an option to degrade P2P voice calls. This is achieved by randomly dropping packets of the voice calls over the voice call period. Voice data is encoded in multiple packets by the codec. Since there is a possibility of packets being dropped in a network, the codec replicates the same information across multiple packets. This provides resilience to random packet drops in the network. For a considerable degradable voice quality, a chunk of packets need to be dropped. By this way, the codec will be unable to decode the required voice information. The chunk size for achieving degradation of voice call varies from one protocol to another. The Random Drop decision has to be made once for a chunk of packets. By choosing the random drop time from a configured range, the drop is achieved at random seconds within a configured range. The packets will drop within a known period of time. For example, if a voice call happens for 2 minutes and if we configure a drop interval of 12–15 seconds, then a packet will be dropped within the first 15 seconds of the voice call.
- The Skype detection cannot detect traffic of most of the third-party plug-ins. The plug-ins use Skype only for marketing and presentation purposes such as opening a window within a Skype window or modifying the main Skype window with buttons or sounds. These plug-ins do NOT use the Skype protocol to transfer data over the network.
- Other than Skype Voice, all detected Skype traffic is marked as Skype. Distinctions between different data types within Skype (i.e. text chat, file transfer, and so on) cannot be made.
- Skype voice detection may not be accurate if it happens with other traffic (file transfer, video, etc.) on the same flow.
See "Cisco ASR 5000 Series Application Detection and Control Administration Guide" - here.