[ILUG] Help needed with VOIP & Digital Phone
watty at eircom.net
Sat Mar 7 11:57:20 GMT 2009
David Howe wrote:
> On Sat, March 7, 2009 10:45 am, Kevin Brennan wrote:
>> Hi Alan,
>> To be clear. VoIP has worked over 3G but I definitely would not
>> recommend it if you are looking for a service which has any reliability.
>> I was merely pointing out the fact that it is possible and in my opinion
>> things will get better (give it 5 years). As Michael pointed out the
>> test we made was anecdotal. From our experience the only broadband which
>> had proved very reliable for VoIP so far is wired.
> It's not a wireless thing. Fixed Wireless Broadband works. A lot of our
> trunk transmission is on microwave links. It's just a mobile issue and how
> the networks are engineered.
An explanation of why it's unlikely that more than 1/3rd of
Mobile users could have reliable VOIP *ever* and Fixed Wireless
Broadband has had reliable VOIP for over 5 years.
For same spectrum, because Mobile has to use omni-directional poor
aerials and low Modem TX power and Fixed uses suitable directional
higher gain aerials the Mobile performance varies hugely with time and
Fixed doesn't other than normal contention, and Fixed Wireless has x10
to x20 AVERAGE performance for same spectrum.
Fixed tends to be ethernet interface and Mobile uses USB, Mini-PCI,
ExpressCard, PCMCIA and may not always have Linux drivers or good linux
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