WOICE is a decentralized system that allows for ubiquitous VoIP services over WiFi networks. It creates a flexible marketplace that provides business opportunities for participants like hotspot owners, ITSPs, and aggregators. The system uses modules to manage tasks like contract negotiation, call routing, and accounting. It aims to build trust between participants through reputation and incentive mechanisms to encourage collaboration.

1. WOICE - a Decentralized System for Ubiquitous VoIP Services Authors: Costas Kalogiros Costas Courcoubetis Panayotis Antoniadis

5. WOICE network scenario

8. Contract terms negotiation

9. Collection of authenticated reachable numbers

11. Non-peer Interoperation

12. Peer Interoperation

16. Thank you for your attention! Questions?