This paper describes an approach for combining Session Initiation Protocol (SIP) based voice communication with Extensible Messaging and Presence Protocol (XMPP) based presence enhancements. The actual role of SIP and XMPP in the Internet Protocol (IP) based communication was analyzed, especially from the telecommunication carrier (Telco) point of view. The proposed infrastructure extends a typical SIP infrastructure with XMPP for presence status integration. XMPP will be used as instant messaging and presence (IM/P) service infrastructure, the presence information will be extended with SIP phone status information of telecommunication endpoints. A first prototype has been developed and tested successfully. Presented at ONIT 2010 in Berlin, Germany.

1. 2. Open NGN and IMS Testbeds Workshop
18. May 2010
Berlin, Germany

2. } Speaker
◦ Sebastian Schumann
◦ Slovak University of Technology, Bratislava, Slovakia
◦ PhD student and member of NGNlab.eu initiative
} Topic
◦ How to bring presence into the Telco market?
◦ What does the presence protocol landscape offer?
◦ What is a concept for tomorrow with which we can
implement already today?
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3. } Introduce instant messaging and presence
service for Telco end-customers
} Main objective is integrating communication
state into a presence infrastructure
} Certain aspects are out of scope
◦ Network service enabler (good, but not yet visible for
end-customer)
◦ SIP/XMPP Gateway (no interworking, exists already)
◦ Presence in the IMS (implementations not yet ready)
◦ Yet another presence service on the Telco side “just to
catch up”
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4. Internet World
} Companies that host web pages or internet
services and offer communication services.
◦ Communication mainly through instant messages
◦ Voice as by-product
◦ Main protocol: XMPP
Telecommunication World
} Telco’s and smaller providers that have
specialized in offering their customers VoIP
based telephony
◦ Currently mainly voice services
◦ Growing move towards Presence and Messaging
◦ Main protocol: SIP
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5. } Standardized protocol
◦ SIP with enhancements (SIMPLE, XCAP, MSRP)
◦ XMPP
} Several aspects important at this very moment
◦ Customer acceptance
◦ Maturity
◦ Interoperability
◦ Protocol landscape
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6. } Introduce the XMPP based presence service
for Telco customers
◦ Basic own infrastructure to serve own customers,
who do not yet have the service
◦ Integrate with existing infrastructure to service
advanced customers
} From voice telephony to communication
◦ Offer voice telephony
◦ Offer messaging + presence
◦ Enhance presence with telephone state information
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7. 7

8. } Telephone state extraction can be easily
added to each infrastructure
◦ Enhanced SIP proxy that can extract call state
information
} SIP call states must be converted to XMPP
presence information
} XMPP as main IM/P protocol
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9. 9

10. } NGNlab.eu set-up
◦ VoIP infrastructure (OpenSIPS, MediaProxy, Asterisk)
◦ Added OpenSIPS with pua_usrloc and pua_dialog
module
◦ Added Ejabberd as IM/P server
◦ Deployed and added “XMPP Publisher”
} SIP call states of any VoIP infrastructure are
available in any XMPP infrastructure
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11. } If SIP based presence will be mature in some
years (e.g., in an IMS deployment with more
clients), the solution can still be used
◦ Telco IM/P will most likely be based on OMA SIP
◦ Web 2.0 services can still be enriched with the call
state information
} Mutual benefits for Telco and internet service,
the customer is happy as well J
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12. 12

13. } Implementation of "XMPP Publisher" almost
ready
} Some problems still under examination
◦ Identity Management (map SIP/XMPP user)
◦ XMPP means for password-less authentication (third
party XMPP service state extension)
◦ Integration of proposed solution into XMPP gateway
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14. } Federating state information will be useful
even in the future, when IMS will be deployed
à Solution can co-exist with SIP based presence
} Telco integration with internet services is
win-win
◦ Telco products are propagated towards internet
◦ Internet services are not competed, but federated
◦ Customer benefits the most
– More features if he has a presence service
– Interoperable IM/P service
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15. Sebastian Schumann
schumann@ktl.elf.stuba.sk
Disclosure
Besides his PhD studies at the Slovak University of Technology, Sebastian is working for
Slovak Telekom, a.s. in the department of development and design.
He is an innovation specialist for SIP based voice services, converged applications and
experienced in the area of NGN and IMS as well as open-source software.
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