... include the following:Management of VPNs, which use privately managed logical channels (or amesh of channels) over public physical links for ENM;Virtual network management, which is a form ... VoIPcall servers. This RTP session runs over UDP/IP across the Intranet or VPNshown in Figure 7-1. The requested LD voice communication can now con-tinue over this RTP session via appropriate ... Kbpscircuits for real-time voice communication over a circuit-switched (PSTN)network, whereas with the same G.711 coding, because of PPP/MAC/Ethernet,RTP, UDP and IP overheads, VoIP transmission...