Path: utzoo!utgpu!watserv1!watmath!iuvax!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: john@bovine.ati.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Breaking the Dial Tone Message-ID: <3611@accuvax.nwu.edu> Date: 6 Feb 90 10:08:14 GMT Sender: news@accuvax.nwu.edu Reply-To: John Higdon Organization: TELECOM Digest Lines: 55 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 83, message 4 of 8 GORDON MEYER <72307.1502@compuserve.com> writes: > phone gives three short beeps (there's probably a name for this signal > but I'm sort of new to telephony) then a short period of silence until > the second dial tone kicks in. It's called "stutter dial tone". Some systems give this signal when you pick up the phone to make a call if something is programmed into the phone, such as call forwarding. The new GTD-5 in Los Gatos does this. > Now all is expected so far, but when my modem dials the rest of the > string the dial tone continues. In other words, it's as if the switch > is now deaf to the rest of sequence. If I try again it usually works > fine...but then later that same night the problem may occur again. "Cancel Call Waiting" is what is known as a "temporary Class of Service change". Telephone switches have class of service tables to define each and every conceivable type of service provided. The features you have, the type of local billing (measured or unmeasured), even the definition of your local calling area are components of the class of service table entry. When you pick up the phone, your class of service is fetched before you even receive dialtone. When you dial #70 you are saying, "Get another class of service." The one you get is just like your regular one except that "call waiting" is denied. Now it is possible that for some reason, in your switch the COS tables are corrupt. The COS you get when dialing #70 also denies touchtone. If this is sporadic, then there could be some real programming difficulties in your switch. These are the worst to get corrected since they usually fall outside the normal trouble shooting procedures and will ultimately require the attention of a "real" switchman, or maybe even a programmer. This COS change on demand can be very powerful. I have a WATS line that is accessable from all my lines. To invoke it, I dial *14. The dialtone immediately returns. What has happened is this: not only has the COS changed, but the phone number as well! It becomes the POTS number for the Full State Outwats. I have confirmed this by dialing *14 and then the readback. > Any suggestions or comments from Telecom readers? To get this corrected, you will have to be persistent. You will frequently be told that no trouble was found, mainly because most of them don't even know what to look for. If you attempt to give them the explanation above, you will get the telephone equivalent of a blank stare. Good luck! John Higdon | P. O. Box 7648 | +1 408 723 1395 john@bovine.ati.com | San Jose, CA 95150 | M o o !