Steve Barlow brought next idea :[color=blue]
> Question #1 - Can I use an ATA with the Tesco VOIP service instead of the USB
> Phone?
>
> Question #2 - Is the Tesco USB phone locked to the Tesco VOIP service or
> could I use it also on say Sipgate?
>
> Thanks - Steve B.[/color]

AFAIK, their service is IAX based. Most ATAs use SIP.

The USB phone is merely a USB soundcard, apparently from
<http://www.yealink.com/>