Even Andrew Rufener, ambassador to the ATM Forum and director of technology for EMEA at Marconi, said: "Service providers are gradually moving away from circuit-switched technologies such as SONET/SDH to packet-switched solutions.
Infonet is now saying that businesses can buy packet-switched voice over an IP VPN as a standalone product, and then add in other data traffic later on," says Henning Dransfeld, senior analyst for enterprise IP services at Ovum.
SDH provides the reliability of circuit-switched pathways and resiliency should there be a fault but it is overly complex and not nearly as flexible as a native IP architecture when it comes to supporting Ethernet services, for example.
On the other hand, when you send an email message via the internet your bits are transmitted in discrete packets that are often routed very differently, packet by packet. But we should also remember that there are limitations to the performance of...
When making calls external to the company, the IP-PBX converts them back into circuit-switched for delivery over the public telephone network. Some carriers now offer VoIP so that calls need not be converted into circuit-switched.
All calls will be routed through the plane's on-board GSM network and charged to the customer on their monthly bill as a standard international roaming call. Once connected to the picocell, the calls are then routed over the aircraft's existing...
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