1. The design, comparison and current status of TWAREN voicemail systems 2007/08/27 Chia-Hung Hsu Li-Chi Ku Che-Nan Yang

2. APAN24 2 Outline  TWAREN VoIP Architecture  Voicemail Systems  SEMS  Unity  Asterisk  Conclusions

3. APAN24 3 Architecture

4. APAN24 4 Architecture (cont.)‏

5. APAN24 5 Architecture (cont.)‏

6. APAN24 6 Voicemail Systems  SEMS (SIP Express Media Server)‏  Media Server for SIP Based VoIP Services.  Separation of Media and Control.

7. APAN24 7 Voicemail Systems (cont.)‏  Modular Design Core and Plug-ins  SER and SIP Proxy Server

8. APAN24 8 Voicemail Systems (cont.)‏  Signaling

9. APAN24 9 Voicemail Systems (cont.)‏  SEMS Services in TWAREN

10. APAN24 10 Voicemail Systems (cont.)‏  Example of Voicemail Format

11. APAN24 11 Voicemail Systems (cont.)‏  CISCO Unity  One of the Cisco® Unified Communication Systems  powerful unified message (e-mail, voice, and fax messages)‏  intelligent voice messaging (full-featured voice mail providing advanced functions)‏  Commercial systems

12. APAN24 12 Voicemail Systems (cont.)‏  Multiple network services integration required: Dynamic Domain Name Servers Directory Servers Message Stores  Supported message store Microsoft Exchange IBM Domino  Standards compliance VPIM （ Voice Profile for Internet Mail ， RFC-3804 ） AMIS （ Audio Messaging Interchange Specification ）

13. APAN24 13 Voicemail Systems (cont.)‏  Signaling

14. APAN24 14 Voicemail Systems (cont.)‏  Signaling (cont.)‏

15. APAN24 15 Voicemail Systems (cont.)‏  Asterisk  PBX Switching Core accept calls from interfaces and handle according to the dialplan.  Application Launcher ring phones, connect to voicemail, etc.  Codec Translator compressed with different codecs to seamlessly talk to one another.  Scheduler and I/O Manager which applications and drivers can take advantage of.  Dynamic Module Loader

16. APAN24 16 Voicemail Systems (cont.)‏  Loadable Module APIs Channel API Application API Codec Translator API File Format API

17. APAN24 17 Voicemail Systems (cont.)‏

18. APAN24 18 Voicemail Systems (cont.)‏  Signaling

19. APAN24 19 Conclusions badgoodbadUser Friendly independent shareDatabases wav/gsmwav File Format SIP / H.323 / IAX / Skinny / PSTNSIP / SkinnySIPProtocol lowhighlowSecurity noyesnoReport Sendmail / PostfixMicrosoft ExchangeSendmail / PostfixMail Server SMTP / SIP SMTPMessages easyhardeasyGetting Resource hardmedianeasyDifficulties lowhighlowCost Linux/BSD/Mac OSWindows 2000Linux/BSDOperation System X86 PCMCS ServerX86 PCHardware freelicensefreeLicense DigiumCISCOiptelVendor/Integrator AsteriskUnitySEMS