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Interconnecting P2PSIP and IMS. Jani Hautakorpi ¹ , Arturo Salinas ¹ , Erkki Harjula ² , Mika Ylianttila ² ¹ Ericsson Research Nomadiclab ² MediaTeam Oulu Group, University of Oulu NGMAST’08 16-19th Sep 2008 Cardiff, Wales, UK. Content. Motivation and background

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interconnecting p2psip and ims

Interconnecting P2PSIP and IMS

Jani Hautakorpi¹, Arturo Salinas¹, Erkki Harjula², Mika Ylianttila²

¹Ericsson Research Nomadiclab

²MediaTeam Oulu Group, University of Oulu

NGMAST’08

16-19th Sep 2008

Cardiff, Wales, UK

content
Content
  • Motivation and background
  • Interconnection architecture:
    • Overview
    • Preliminary procedures
    • Session establishment from P2PSIP to IMS
    • Session establishment from IMS to P2PSIP
  • Prototype
  • Future work
  • Conclusions

NGMAST'08

motivation and background 1 3
Motivation and Background (1/3)
  • Many ways to communicate
  • Quite often no interconnection mechanisms
  • This lead to separated islands

NGMAST'08

motivation and background 2 3
Motivation and Background (2/3)

P2PSIP

network

IMS

network

AS

S-CSCF

SIP

HSS

P-CSCF

NGMAST'08

motivation and background 3 3
Motivation and Background (3/3)
  • Excluded topics:
    • IPv4/IPv6 interworking
    • NAT traversal
    • Media handling
    • Charging

NGMAST'08

interconnection architecture 1 6 overview

Gateway AS

Interconnection Architecture (1/6)Overview

P2PSIP

network

IMS

network

P2PSIP to IMS

IMS to P2PSIP

NGMAST'08

interconnection architecture 2 6 preliminary procedures
Interconnection Architecture (2/6)Preliminary Procedures
  • Gateway AS registers itself to the P2PSIP network
  • IMS users have to set up their iFCs
  • P2PSIP users do not have any preliminary procedures

NGMAST'08

interconnection architecture 3 6 session establishment from p2psip to ims 1 2
Interconnection Architecture (3/6)Session Establishment from P2PSIP to IMS (1/2)

P2PSIP UA (at p2p-domain.com)

Novel URI handling

mechanism

SIP INVITE to user@ims-domain.com

Does the host name

match my domain?

no

get

Get to

H(ims-domain.com)

P2PSIP

network

IPGW

yes

SIP INVITE

to IPGW

INVITE

get

Get to H(user@

p2p-domain.com)

IPUSER

SIP INVITE

to IPUSER

INVITE

NGMAST'08

interconnection architecture 5 6 session establishment from ims to p2psip 1 2

Gateway AS

Interconnection Architecture (5/6)Session Establishment from IMS to P2PSIP (1/2)

SIP INVITE to

user@p2p-domain.com

S-CSCF

Evaluate the trigger point in iFC:

Session case=Originating

Request-URI=*@p2p-domain.com

IMS

UA

P-CSCF

HSS

NGMAST'08

prototype
Prototype
  • We implemented a prototype from the Gateway AS
  • Used Open IMS Core
  • Used Sofia-SIP
  • Used SIPp
  • Result: Proposed architecture is valid

NGMAST'08

future work
Future Work
  • Studies related to charging: Probably different mechanisms for each direction
  • Media handling: Possibly a need for intermediary media elements
  • IPv4/IPv6 interworking

NGMAST'08

conclusions
Conclusions
  • We proposed an interconnection architecture between P2PSIP and IMS:
    • Contains novel URI handling mechanism
    • Does not require changes to IMS terminals
  • Prototype proves that the proposed architecture is valid

NGMAST'08