Re: Re: Sky / Sky + dial home - what is it up to

["UKHA" <ukha@xxxxxxxxxxxxxxxxxxxxxxx>]

On 14/12/2005 at 09:50 patrick_o_matic wrote:
>
>Depends on the VOIP service. Many providers will allow you to set CLI
>to match either one or more incoming numbers they provide to you, or
>if you provide them with a copy of a BT bill, will allow the CLI to
>mirror that of your BT line.
>
>Running a modem over a VOIP circuit is a bit hit-and-miss, so if the
>Sky box does anything more than just attempt a call, you may need to
>fiddle with codec choices and turn off echo cancellation.
>

Indeed, only use ulaw/alaw (g711) for any sort of modem/fax unless you have
T.38.
codecs like g729/g723 are designed to compress audio and eliminate
frequencies
we can't hear - computers can hear better ;) so need uncompressed audio.

The latency is also a huge factor anything bigger than a few ms and you'll
run into
problems. This is going to be the #1 cause of failures (if you've switched
to g711).

As for echo, well IME modems and faxes seem to quite like it :) definately
turn of any echo
can.

How often do these sky boxes need to phone home?


Andy





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