Kalogiros- Woice - - a Decentralized System for Ubiquitous VoIP Services

  • 259 views
Uploaded on

 

More in: Technology , Business
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
259
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. WOICE - a Decentralized System for Ubiquitous VoIP Services Authors: Costas Kalogiros Costas Courcoubetis Panayotis Antoniadis
  • 2. Motivation
    • ‘ Voice is just another Internet application’
      • Multiple end-user identifiers at the same time
        • End-devices with multiple network interfaces
    • VoIP can be an antidote for ‘monopoly termination’ problem, but:
      • ubiquitous access to Internet is required
      • interconnection agreements must be promoted
  • 3. WOICE (Wireless vOICE)
    • A distributed system supporting ubiquitous VoIP services over WiFi networks
      • Flexible marketplace
        • Business opportunities for all participants
        • Semi-automated contract management
      • VoIP-peering accommodation
        • Community spirit establishment
        • Mapping system for end-user identifiers
          • Telephone number ↔ SIP address
  • 4. WOICE entities
    • WOICE WISPs : Hot-Spot owners setting the access network over which WOICE services can be provided to end-users by third parties.
    • WOICE ITSPs : ITSPs that use WOICE modules for offering and supporting VoIP services to their subscribers.
    • WOICE Aggregators : WOICE ITSPs that also set up bilateral agreements with WOICE WISPs.
    • Traditional providers : PSTN, cellular and VoIP providers being interconnected to WOICE.
    • End-users : Regular Hot-Spot users (like employees) or visitors that own dual WiFi/cellular handsets.
  • 5. WOICE network scenario
  • 6. WOICE service scenario
    • WOICE WISP collects mobile number of “User A” and assigns a temporary SIP address
    • WOICE WISP informs WOICE Aggregator about the new mapping
    • WOICE Aggregator advertises this mapping to WOICE network
    • “ User B” calls “User A” on her traditional mobile phone number
    • WOICE ITSP of “User B” routes the call to the temporary SIP address of “User A”
    • WOICE ITSP and WOICE Aggregator exchange accounting information
    • End-to-end VoIP call is being performed
    • WOICE ITSP and WOICE Aggregator rate each other and values are stored in WOICE network
    WOICE Aggregator F WOICE ITSP WOICE WISP Rest WOICE network User B User A
  • 7. WOICE modules (1/2)
    • Contract life-cycle management
      • Contract terms negotiation
    • Call routing information management
      • Collection of authenticated reachable numbers
      • Propagation of/search for supported numbers
    • Call management
      • … especially call routing & setup
    • Accounting :
      • Transaction tracking
  • 8. Contract terms negotiation
  • 9. Collection of authenticated reachable numbers
  • 10. WOICE modules (2/2)
    • Reputation mechanism
      • Distributed mechanism for storing a measure of participant’s aggregated behaviour
    • System rules
      • Distributed configuration of system parameters
    • Group membership:
      • Join/leave/expel procedures
      • Distributed partner search
  • 11. Non-peer Interoperation
  • 12. Peer Interoperation
  • 13. WOICE impact (1/2)
    • WOICE WISPs
      • Core business becomes more attractive
      • New potential revenue streams
    • WOICE Aggregators, WOICE ITSPs
      • Advanced VoIP services roll-out
      • Lower termination costs
  • 14. WOICE impact (2/2)
    • Traditional providers
      • Lower termination costs
      • Higher competition from ITSPs
    • End users
      • Availability of advanced VoIP services
      • Lower charges due to increased competition
    • Regulators
      • Less need for ex-ante regulation
  • 15. Summary
    • WOICE is a collaborative marketplace allowing participants to implement a wide range of business models.
    • Sufficient levels of trust will be built through carefully designed incentive mechanisms.
    • “ Plug and play” functionality for effortless participation
  • 16. Thank you for your attention! Questions?