2. How Smart Is Your Gateway? Lior Moyal – Director, Product Marketing AudioCodes

3. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Evolution

4. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara In the beginning… Gateways were simple MGCP or H.323 –Softswitch had total control –Little intelligence in the gateway G.711 only No tone detection No Packet Loss Concealment Static Jitter Buffers And they sounded like it!

5. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara The First Step in Evolution Customer’s wanted more Voice Compression –G.723 and G.729 Packet Loss Concealment Simple Echo Cancellation

6. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara More Steps… Better performing LBR Coders –Annexes to G.723 and G.729 –AMR, EVRC and QCELP for wireless –iLBC for Internet applications Advanced Packet Loss Concealment Improved Echo cancellation –64 and 128 msec echo tails –Better convergence and performance

7. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara A Big Evolutionary Step Gateways “Come of Age” Advanced Call Control - SIP OAM –Command Line –Embedded SNMP –Web-based management Standard PSTN Protocols –CAS Signaling –PRI –T1, E1 and J1 Physical Interfaces Fault Tolerance

8. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara This last year or two Important trends that are changing the media gateway market

9. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Trend: Designing for Reliability

10. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Faults and Failures Network Failures –Dropped packets –Poor throughput –Interruptions –Complete Outages Equipment Failures –Failed equipment –Lightning / “Backhoe Induced Interruption” Power Failures –Loss of power at site –Over-temp shutdown

11. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Designing for Failures: Diversity “Rack and Stack” or Distribute Equipment –No one single point of failure –Spread out load and risk –Low cost equipment SIP Proxy must route around failed equipment

12. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Designing for Failures: Redundancy Built-in Redundancy –1+1 –N+1 Automatic Failover Hot Swap Pros: –Reliability Cons: –Complexity –$

13. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Proxy Routing Proxy detects and routes around failed equipment SIP Proxy Media Gateways INVITE

14. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Backup Proxy Devices are programmed to seek pre-arranged backup after loss of communications with primary Primary Proxy Backup Proxy Media Gateway Proxy, Are you okay?

15. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Example: Distributed Architecture Primary Proxy Backup Media Gateways Dual LAN Dual Switches

16. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara PSTN Fall-back Gateway Automatically measures network quality Redirects calls through backup TDM circuit upon failure G/W T1/E1 Back-up T1/E1 SIP Media Gateway Network Ok?

17. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara PSTN Fall-back: Example PSTN WAN

18. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Trend: Security Applications for Security Cable Telephony Contact Centers Hosted IP-PBX Financial Services Government

19. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Points of Risk Signaling Voice IP Management SIPS SRTP HTTPS

20. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Trend: Media Processing Need for Applications to “hear” network tones –Live Answer –No answer –Busy –SIT –Fax –Answering Machine Applications –Contact Center –Notification –IP-PBX

21. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Trend: Blades Blade Architecture –PCI, cPCI –Advanced TCA –BladeCenter Advantages –Cost effective –Greater density –Easier to manage

22. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Summary A lot has changed in just the last few years Protocols and Architectures have evolved (IMS) Equipment has evolved too!

23. www.voipdeveloper.com August 8-10, 2006 Santa Clara, California Hyatt Regency Santa Clara Thanks!