> It does read as if nokia is going to build the system and charge for
> it. It says one bill, so maybe it will be a mobile phone provider that
> will offer the system. I think people should be able to choose their
> provider, not be locked in!!
> If you have a mobile phone on 3G now, can you not connect to the
> internet with it and use a standard softphone? I think this is possible
> isn't it??
It may well be possible, but whether or not it's usable is another matter
entirely. The main concern with IP over 3G is the latency, ie how long it
takes your speech to digitised, compressed, transmitted, decompressed and
converted back to analogue at the other end. The transmission bit is
dependant on the network you are using, and the oft-quoted figure is for a
maximum of 150ms latency [http://www.voip-info.org/wiki/view/QoS]
. I have
never used 3G data first hand before, so I've got no idea how well they
perform, w.r.t. QoS.
Whilst simply pinging across a 3G data link may give you a rough idea about
how well it will work, but one ICMP packet per second is not the same as
many UDP packets per second. Now I'm not one to don a tin foil hat for no
reason, but I reckon the 3G networks have very little interest in ensuring
that your packets get where they're going in the right order or in a timely
manner. So I would be interested to see some test results, and I would be
entirely unsurprised to find 3G unsuitable for VoIP.
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