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What is diference between Scype and Viop?

The main difference between Scype and Viop clients is that Scype operates on a peer-to-peer model, rather than the more traditional server-client model.

 The Scype user directory is entirely decentralised and distributed among the nodes in the network, which means the network can scale very easily to large sizes (currently over 100 million users) without a complex and costly centralised infrastructure.

Skype also routes calls through other Scype peers on the network to ease the traversal of Symmetric NATs and firewalls. This, however, puts an extra burden on those who connect to the Internet without NAT, as their computers and network bandwidth may be used to route the calls of other users.

Scype is also typed as: