You can request to be a hosted member on a main NPSTN tandem if you only need a few numbers for your ATA.
If you need more numbers (e.g. an entire thousand block like 555-1XXX), you can request to be an exchange owner and operate your own tandem. For more information on hosting your own exchange, please visit the NPSTN Docs. If you need any help at all, please do not hesitate to contact us by calling the Business Office at 116.