How Smart Is Your Gateway?

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

3. Evolution

4. 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. The First Step in Evolution Customer’s wanted more • Voice Compression • G.723 and G.729 • Packet Loss Concealment • Simple Echo Cancellation

6. 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. 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. This last year or two Important trends that are changing the media gateway market

9. Trend: Designing for Reliability

10. 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. 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. Designing for Failures: Redundancy • Built-in Redundancy • 1+1 • N+1 • Automatic Failover • Hot Swap • Pros: • Reliability • Cons: • Complexity • $

13. Proxy Routing • Proxy detects and routes around failed equipment INVITE SIP Proxy Media Gateways

14. Backup Proxy Devices are programmed to seek pre-arranged backup after loss of communications with primary Proxy, Are you okay? Primary Proxy Media Gateway Backup Proxy

15. Example: Distributed Architecture Primary Proxy Media Gateways Backup Dual Switches Dual LAN

16. PSTN Fall-back • Gateway Automatically measures network quality • Redirects calls through backup TDM circuit upon failure SIP Network Ok? G/W T1/E1 Back-up T1/E1 Media Gateway

17. PSTN Fall-back: Example WAN PSTN

18. Trend: Security Applications for Security Cable Telephony Contact Centers Hosted IP-PBX Financial Services Government

19. Points of Risk Management Signaling SIPS IP HTTPS Voice SRTP

20. 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. Trend: Blades • Blade Architecture • PCI, cPCI • Advanced TCA • BladeCenter • Advantages • Cost effective • Greater density • Easier to manage

22. Summary • A lot has changed in just the last few years • Protocols and Architectures have evolved (IMS) • Equipment has evolved too!

23. Thanks!