I have some phone numbers doesn't work well

"Jun Guo" <[email protected]> Tue, 26 Sep 2006 23:12:35 +0800

Newsgroups	gmane.comp.gnu.bayonne.devel
Message-ID	<2AFB08AC9E50C9419CD4F9704890B59510E234@domain01.tangerinetech.com>

I have some phone numbers 408-795-XXXX sometimes doesn't work,often get
a busy line,
but the phone numbers 408-794-XXXX work well.
What's wrong with it?
Should it be the bayonne or telephone office?