Re: Send-n, rat holes and real issues

> Can someone in the UK doing send-n please give us a rough idea of the
> ratio of known and unknown rather than everyone keep speculating over
> the scale of this.

As far as I know the UK regulator does actually have a very good idea of 
the number lengths, although the published information isn't always 100% 
up-to-date.

The UK issue is the very large size of the prefix->length table, and the 
need to accurately maintain it in every switch in the UK telephone 
network.

Currently a mixture of static tables and ISUP SND is used, but with NGN 
interconnect over IP coming soon the latter method won't be available.

Ray