Jamie,
I'm going to hazard a guess you mean flushing data for
'Do not call' numbers, if so your starting point will be
the Telephone Preference Service (TPS. See below...
TPS SITE LINK
There are numerous companies that provide either
a) Pre-cleaned lists.
or
b) The list data for you to clean your own data against.
Please be aware if you are cold calling you have an obligation
to clean your data before calling and again at regular intervals.
Also, if using a dialler there are stringent constraints
on how and when you can dial, along with restrictions
on silent calls, callback methodologies.
Darryl has a good guide here:-
Darryl Beckford's Site
and the OFCOM restrictions are here.
OFCOM SITE
Hope it helps
Regards
DaveA
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