Presented at Deutsche Telekom University of Applied Sciences "Science Days" 2010 in Leipzig, Germany.

1. Hochschule für Telekommunikation Leipzig
Science Days
3. November 2010
Leipzig, Germany

2. Facts
} Next generation communication infrastructure on STU Bratislava
(shared deployment of faculties for electronics and informatics)
} Playground to implement results of research in the area of IP
based services
Vision
} Open and transparent server and service infrastructure
} Cost-efficient investment that offers high-end open
communication environment
An Example
} Presenting of how far we went already in the world of standard
compliant and free software
} Showing that the use of open-source software in education can
be tremendously supportive
} Shocking operators in what some pieces of hardware can do
2

3. } Virtual laboratory, just with a wider distribution
of the used infrastructure in the community
} More partners massively increase the efficiency
of all ngnlab.eu members
◦ Re-use the existing deployment and know-how
◦ Distribute core components to simulate real multi-
operator infrastructures (security, network parameter)
◦ Integrate and cross-test new applications
} 1st step proofs feasibility: Long term successful
STU+ST cooperation in ngnlab.eu project

4. } Complete SIP based communication
infrastructure
◦ Basic SIP services (registrar, proxy)
◦ NAT traversal, media relay
◦ Integrated voice mail system, conferencing engine
◦ Media gateway through VoIP trunk
◦ Presence service
} We can in fact become a small VoIP operator.
4

5. } Complete IMS service infrastructure
◦ IMS core (P/I/S/E-CSCF), HSS
◦ Integrated presence management
◦ XDMS (ft. authorization, resource lists)
◦ SIP application server
} IMS integrated IPTV
◦ Three channels
◦ Network based video recorder (nPVR)
◦ IPTV messaging
◦ Broadcasts
5

6. Hardware
} A rack each site
} A couple of servers
} Some basic switches
} UPS
6
Courtesy of ScriS (www.flickr.com)

7. Software
} 0 €
7

8. } Everything running on STU servers is OSS
◦ Operating system
◦ Virtualization software
◦ SIP server, media server
◦ IMS core
◦ Application server
◦ IPTV solution
8

9. } "the act of virtualizing"
} … to run a program in virtual storage
} … to simulate some effect or condition on a
computer
} Virtual: defined in philosophy as "that which
is not real"
Courtesy of Wiktionary (www.wiktionary.com)

10. } “Virtual laboratory”
◦ Deployment of physical infrastructure on two sites
at the university in Bratislava and one site at Slovak
Telekom, a.s.
} “Virtual servers”
◦ Each physical server hosts several virtual machines
} “Virtual networking”
◦ Virtual LANs to separate network traffic for security
and research (monitoring)
◦ Not restricted to physical connections
DateAuthor / Presentation title 10

11. } FEI lab
◦ 5 physical servers (all running GNU/Linux)
◦ 1 management switch, 1 traffic switch (L3)
} FIIT lab
◦ 4 physical server (all running GNU/Linux)
◦ Connected to university switch
◦ Routing, management etc. through Linux router
} ST lab
◦ 2 physical server (VMWare ESX, Solaris)
◦ Shared NAS server

12. } Several virtualization techniques are used
◦ Full virtualization
– ST: VMWare ESX Server 3.0.1
– STU: Xen 3.2 (hardware-assisted virtualization, HVM)
◦ Paravirtualization
– STU lab: Xen 3.2
◦ OS-level virtualization
– ST: Solaris 10 Containers
} Oracle VirtualBox and VMWare server used on
notebooks to emulate several client instances

13. } Distributed labs interconnected with OpenVPN
◦ Linux routers on STU and a dedicated virtual
machine on ST run the software
◦ IPTables used to solve NAT problem
} Within each lab configured VLANs to separate
traffic and enforce security policies
◦ Native VMWare ESX and Solaris 10 feature
◦ Xen servers use user mode enhancements for kernel

14. } Traffic separation according
◦ Connection type
– Network traffic
– Management of physical and virtual machines
◦ Service
– Each service has own VLANs (VoIP, IMS, IPTV)
◦ Protocol
– Signaling: SIP, XMPP, Diameter
– Media: RTP, RTMP
} Easy enforcement of security policies and
network traffic monitoring

15. Sig Med
apt
Monitoring
Sig
DB
DB
Router

16. Sebastian Schumann
schumann@ktl.elf.stuba.sk
16All registered trademarks are property of their respective owners.

17. Sebastian Schumann
schumann@ktl.elf.stuba.sk
Disclosure
Sebastian works for Slovak Telekom, a.s. in the development and design department. He is a senior
application designer in the area of voice services, IP Multimedia Subsystem, and converged applications.
On the Slovak University of Technology, Sebastian is currently in his 3rd year of his PhD studies. He focuses
on next generation identity management and its potential in service personalization and collaboration.
Slovak Telekom, a.s. and the Slovak University of Technology are members of the ngnlab.eu initiative.
17All registered trademarks are property of their respective owners.