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To: Tulvio Durand who wrote (18493)	10/28/1998 12:47:00 PM
From: Pierre Aydin	Read Replies (1) \| Respond to of 77398

<<These limitations are very apparent when my son talks to his buddy via computer modems.>> Your modem and connection to the Internet is very slow that's why your son is having problems with quality and delay. Perhaps in a corporation where you have much faster networks, IP telephony could be reality, from what I have been reading both systems will be used. Pierre

To: Tulvio Durand who wrote (18493)	10/28/1998 1:09:00 PM
From: frankd	Respond to of 77398

Call quality is measured by something called Mean Opinion Score or MOS. These are subjective tests where people listen to the calls and rate their quality. The voice-over compression technlogies (i.e. G.729) are actually just slightly less than Toll Quality (based on MOS scores). There are additional issues with voice quality over the Internet, primarily queing and delay. The general Internet is not providing higher level quality of service for these packets, this is something for which you pay extra. Check out ICG-Netcom's deployment of VOIP at www.netcom.com. There are many others you can research. The key answer here is, the general internet will not provide the quality of service necessary for near Toll Quality voice service, but you can get it.

To: Tulvio Durand who wrote (18493)	10/28/1998 1:13:00 PM
From: The Phoenix	Read Replies (1) \| Respond to of 77398

Tulvio, Pierre's response is partially correct. There are two major problems with the scenario your son experiences. One he is using the internet as the backbone which is different than using an IP based backbone for voice (like QWST), and second the internet can not discern the difference between a telephony packet and a data packet - at least not today. That is there is not QoS. This issue is very quickly being wrestled to the ground. New features such as IP Precendence bits, and RSVP will allow networks to differentiate between real time and non-real time traffic and transmit them through the backbone accordingly. Voice on the internet will actually be voice supported by the ISP but that voice will be "peeled" off at the POP and delivered to a circuit switched network (at least for the next few years). Going forward these circuit switched networks will be "churned" into packet based networks mainly because packet networks can support more users for a given amount a bandwidth resulting in lower cost for the carrier. The real challenge will be IP based network reliability. Again, this is an area where the vendors are running fast and hard. It's only a matter of time. So, it's not an "if", it's a "when". IP networks ARE the networks of the future. OG