1. Internet
... Special gateways installed at both the sending and receiving end of a communications channel converts voice to IP packets and back again to voice. This process must take place in a time frame of less than 100 milliseconds to sustain the Quality of Service (QoS) that users are accustomed to ... voice packet must transition back from the IP network to the PSTN, to the receivers' modem for conversion back into analog. Each of these steps adds more delay to the voice packets. A delay approximately of over 550 milliseconds, which is 400 msecs over the QoS acceptable limit, is ... issues, an...
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