04/19/23 SIP 2008

P2PSIP - with a bit less (Sk|h)ype

Henning Schulzrinne

Dept. of Computer Science

Columbia University

04/19/23 SIP 2008

Good reasons for P2PSIP

• rapid deployment in environments without sys admins and infrastructure

• advanced media services (computational, storage)• chance to get user agents right

LANLAN hot spothot spot homehome

McD’sMcD’s Internet2Internet2

P2PageP2Page public P2P

enterprise

mDNS (Bonjour)

04/19/23 SIP 2008

The wrong reasons• Skype envy

– P2P incidental to success• ease of use - out-of-the-box

experience• NAT traversal• good audio component (adaptive

playout, error concealment, codecs)

– can support 100k users on single $100/month SIP server

• TURN and conferencing more interesting

– still need authentication infrastructure

• Service creation– same end-system services as in CS

SIP– web-based services rely on hosting

providers– good APIs more important than P2P

vs. CS

04/19/23 SIP 2008

Risks

• Standardization– Merger in progress: ASP + RELOAD + P2PP = ?– Science project (HIP) + IPR digging vs. engineering

• Technology– Security risk of open protocols: rogue nodes– Operational reliability (see Skype outage)– Service creation: Grandcentral-like services?– Extension to mobile nodes?

• power, computing, reliability

• Business model– Who is going to run the network?– 2007 revenues: $250M ($1.60/user account/year); Vonage: $800M– hard to do Skype-bis: value proposition?– more likely: vertical markets, games