1. Microsoft Telephony Platform with Windows 2000 Tomislav Bronzin B. Sc. EE/CS CITUS d.o.o.

3. Communications Opportunity Worldwide estimates. End customer spending. Variety of sources. Does not include public carrier spending. Selected categories 1999 2002 Enterprise Internetworking Server-based RAS $1.4B $1.6B 3% VPN .3 1.8 81% Routing 7.7 11.5 15% LAN Switching 13.5 17.6 9% Enterprise Telephony PBX 7.5 6.7 -2% Key systems 6.5 8.2 6% Voice Mail/ Unified Msg 4.9 6.6 8% Interactive Voice Response 2.9 5.1 15% Call Center - ACD 2.3 3.4 10% Call Center - Applications 8.6 18.9 22% Total $55.6B $63.8B 10% CAGR

5. The Paths Toward Unified Communications Unified Communications

6. Convergence & Computer Telephony Isolated Server PBX Connected Server PBX Converged Communications Server

7. Enabling Enterprise Telephony Solutions Phone system role: important/only touch point for customers or Internet PBX / Key with Voice Apps Voice trunk or line PBX / Key Voice / Fax App Server(s) PBX / Key Voice / Fax App Server(s) Voice trunk or line PC PBX with Voice Apps PSTN

8. Owning and Operating a PBX Source: Forrester Research (10/97)

9. PBX Replacement Reasons Large Companies Feature completeness is key factor Call center features drive many PBX buys 50 39 33 10 9 7 4 2 7 0 10 20 30 40 50 60 Features Capacity Age of System Reliability Cost Overall Upgrade Relocation Compatibility Other Copyright Business Research Group - October 1994

11. CTI Consideration in Call Centers (U.S.) 1996 Survey Source: Pelorus Group (6/99) 1999 Survey 1996 1999 13% 26% Using 13% 26% 16% 34% 5% 14% 16% Not Considering 34% Against 5% 14% 3% 41% 1% 36% Trialing 3% 1% Considering 41% 36% Implementing 6% 7% 6% 7%

14. CRM Market Segmentation Key Verticals: Financial Services, Healthcare, Mfg, Hi-Tech Sales Force Automation Customer Service & Support Call Centers Help Desk Customer Interaction Centers Mobile Marketing Automation Channel Mgmt (PRM) Internet / PSTN Selling Service

18. Changing Perceptions of Windows Communications Server-on-a- ”Blade” Large-scale Server Clusters Lots of form factors High-End Networking Systems Traditional

22. TAPI 3.0 Architecture TAPI 2.1 Call Control C API Unimodem TSP PBX PBX Driver PBX TSP TSPI NDIS 5 TSP ATM/ISDN NDIS 5 Miniport Modem Modem Driver TAPI Server Codec Audio RTP DirectShow filter graph NIC TCP/IP Winsock 2.0 MSPI COM API TAPI 3.0 Call Control Media Control Directory Control H.323 TSP IP-MC TSP NDIS5 MSP Unimodem MSP H.323 MSP IP-MC MSP LDAP AD

25. NetMeeting Web Integration

27. Recent News Unified Messaging Vision Online Device Wireline Phone Wireless Phone The Global Knowledge Worker Page Email Vmail Calendar Directory Fax News & Stocks

28. Today’s Typical Infrastructure PBX / Key Voice / fax App Server(s) Voice trunk or line PSTN Proxy / Firewall Router Internet

29. Adding IP Telephony Proxy / Firewall PBX / Key Voice trunk or line Router Internet Voice / fax App Server(s) With H.323 Proxy IP / PSTN Gateway ILS -> Gatekeeper IP Telset NetMeeting IP / PSTN Gateway PSTN NetMeeting ILS - >Gatekeeper NetMeeting

30. Convergence PSTN PBX / Key Proxy / Firewall Internet Router NetMeeting ILS - >Gatekeeper Internet PBX/Key IP Access Router IP / PSTN Gateway Gatekeeper H.323 Proxy Voice / fax App Server(s) IP Telset NetMeeting NetMeeting Proxy Firewall