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VoIp Usability 

 PSTN Delay next

Speech quality influences :
  • fixed transmission time
  • long-distance trunk transmission time
  • Voice signal processing
  • Recieve Jitter buffering
  • Transmit packetization
  • Buffering
  • Queuing
  • Switching/ Routing
  • Voice signal processing
  • Recieve - Jitter buffering
  • Transmit packetization

Feedback when not using a headset.