NTI Custom coverage

[Pierre-Marie Andre]

Hi tregers,
We are looking for some general information on ISDN Network coverage in
USA.
Does somebody know what is the coverage of  NTI Custom as opposed to NAT1,
NAT2 and ATT Custom?
Any contact point or Web site would be welcome (I have not seen this in the
www.data.com web site )
thanks
Pierre-Marie
Shiva International           Senior Worlwide Approval Engineer