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How Smart Is Your Gateway?

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

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How Smart Is Your Gateway?

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

  2. Evolution

  3. 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!

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

  5. 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

  6. 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

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

  8. Trend: Designing for Reliability

  9. 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

  10. 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

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

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

  13. 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

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

  15. 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

  16. PSTN Fall-back: Example WAN PSTN

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

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

  19. 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

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

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

  22. Thanks!

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