TELECOM Digest Tue, 11 Jan 94 09:16:00 CST Volume 14 : Issue 24 Inside This Issue: Editor: Patrick A. Townson Book Review: "Sendmail" by Costales/Allman/Rickert (Rob Slade) Call Waiting/Three-Way Together (Michael Israeli) Someone Has Tapped My Line - Help (Joel M. Hoffman) Possible Internet Service Scam (Les Reeves) NYTel/NYNEX Dusts Off Rotary Payphones (Paul R. Coen) Network Outage in 205 NPA? (Paul Cook) Truckstop Calling Cards (Scott M. Pfeffer) Cell Phone Charges: Can You Pay With a Calling Card? (Velu Sinha) Touch-Tone Dial Pads? (Willie Smith) Re: SW-56 and ISDN Questions (Susan Sirmai) Oracle and Bell Atlantic ADSL Service (Randy te Velde) Inquiring Minds Want to Know (Alec Isaacson) 50 Pin Connector Help Wanted (John Stewart Pinnow) Phone Line Simulator Wanted (David Jones) Distinctive Ringing and Ring Detectors (Bob Rankin) New ATTmail Charges (David Appell) TELECOM Digest is an electronic journal devoted mostly but not exclusively to telecommunications topics. It is circulated anywhere there is email, in addition to various telecom forums on a variety of public service systems and networks including Compuserve and GEnie. Subscriptions are available at no charge to qualified organizations and individual readers. Write and tell us how you qualify: * telecom-request@eecs.nwu.edu * The Digest is compilation-copyrighted by Patrick Townson Associates of Skokie, Illinois USA. We provide telecom consultation services and long distance resale services including calling cards and 800 numbers. To reach us: Post Office Box 1570, Chicago, IL 60690 or by phone at 708-329-0571 and fax at 708-329-0572. Email: ptownson@townson.com. ** Article submission address only: telecom@eecs.nwu.edu ** Our archives are located at lcs.mit.edu and are available by using anonymous ftp. The archives can also be accessed using our email information service. For a copy of a helpful file explaining how to use the information service, just ask. 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Any organizations listed are for identification purposes only and messages should not be considered any official expression by the organization. ---------------------------------------------------------------------- Date: Mon, 10 Jan 1994 00:34:07 MDT From: Rob Slade Subject: Book Review: "Sendmail" by Costales/Allman/Rickert BKSNDMAL.RVW 930922 O'Reilly & Associates, Inc. 103 Morris Street, Suite A Sebastopol, CA 95472 800-998-9938 707-829-0515 fax: 707-829-0104 info@ora.com "sendmail", Costales/Allman/Rickert, 1993, U$32.95 costales@icsi.berkeley.edu eric@cs.berkeley.edu rickert@cs.niu.edu Sendmail might not be the heart of UNIX mail and communications services, but it certainly is a good portion of the autonomic nervous system. Although considered venerable by some, it is also extremely widely used. This book hopes to make sendmail administration not only easy, but fun. Quite a task. Part one of the book is tutorial in nature, starting with background information in chapter one. We are given a brief history and philosophy of sendmail, plus some description of the component parts, and the related Internet RFCs (Request For Comment) and technologies. (RFCs, the name to the contrary, are the descriptions of how Internet functions should work. In a sense, they are the standards of the Internet.) Chapter two gives us some examples of how "subnetworks" of machines within the Internet handle mail among themselves, and introduces routing, very briefly. It takes its tutorial function seriously: there are questions at the end of the chapter for you to think about or try out. The questions get harder in chapter three, and start requiring more knowledge of both UNIX and the RFCs, in order to deal with headers and "envelopes". (Actually, the text is easy. Only the questions are hard.) Chapter four introduces the various related programs that sendmail calls and the functions it performs. So it continues up to chapter fifteen. The tutorial covers the invocation and switches, the configuration file, mail delivery agents, macros, rules, rules and more rules, class macros, options, headers, and miscellaneous topics. Part two deals with administration and management, and runs you through the process of configuring, compiling and installing sendmail. It also has specifics of V8 and IDA, as well as DNS (Domain Name Server). Topics covered include security, the queue, aliases, mailing lists and forwarding logging and statistics. Part three is the reference, and chapters twenty-three to thirty-three list the options for delivery agents; defined, class and database macros; options, headers, the command line and debugging. Finally, seven appendices deal with queue file intervals, obscure error messages, the "define" macros in the confi.h file, the client.cf file from the tutorial, V8 and IDA configuration macros, and a bibliography. Because of the nature of the book, you will find a fair amount of material duplicated (for example between the tutorial on delivery agents, and the reference sections). However, the duplicated material, and the short chaptering make this an excellent reference work overall. The material is generally clear and well laid out. The tutorial section is definitely for the technically advanced: I suspect the authors have a ways to go before many people find sendmail "fun". copyright Robert M. Slade, 1993 BKSNDMAL.RVW 930922 Permission granted to distribute with unedited copies of the TELECOM Digest and associated mailing lists/news groups. DECUS Canada Communications, Desktop, Education and Security group newsletters Editor and/or reviewer ROBERTS@decus.ca, RSlade@sfu.ca, Rob Slade at 1:153/733 DECUS Symposium '94, Vancouver, BC, Mar 1-3, 1994, contact: rulag@decus.ca ------------------------------ From: izzy@access.netaxs.com (Michael Israeli) Subject: Call Waiting/Three-Way Together Date: 10 Jan 1994 11:41:22 GMT Organization: Net Access - Philadelphia's Internet Connection In my house, I have call waiting and three-way calling installed on the same line. They are a great combination, as you are even able to turn off call waiting through the three-way calling on an incoming call. Now, the problem is that when I am on a three-way call, my line becomes busy, allowing no calling to come through. I know other people in different areas who can be on a a three-way call and still receive call waiting. What is the reason for this difference? I called Bell of PA, and they said that it just wasn't available in my area. Anyone know? Michael Israeli izzy@netaxs.com [TELECOM Digest Editor's Note: There are two types of 'three-way' calls. If you are in 'consultation' you have pressed the hook, dialed a number and are talking with a third person while leaving the second person on hold. Situations like that will result in a new caller getting a busy signal. If however you have flashed, dialed the third party and gotten him on the line, then flashed again so that the three of you are talking then call waiting should become available once again. At that point if there is a call waiting, flashing will leave your two three way parties (from your outgoing call) on hold unable to speak to each other while you take your new incoming call. The reason a busy signal has to be given to a new arriving call during the early stages of a three way call (when you have flashed, gotten dial tone and brought one additional party on the line but not yet joined that party with your call in pro- gress) is because you only have one flash of the hook available to you and there is a conflict at that point as to whether the flash should cause the newly dialed third party to join your outgoing call or it should cause the whole thing to go on hold while you speak to the newly arrived call waiting. Try getting an actual three way call installed (not just to the beginning 'conference' stage where you talk to a third party and tell him you are attaching him to the call in progress) where you are talking to two parties (both of whom *you originated*) then see if call waiting does not work okay once again. Where there is a conflict between CW and 3WC (because flashing the hook could cause one thing to happen or the other) then 3WC takes priority. The theory is should telco hand you a CW at that point in time does your flash mean you want to accept the new call or connect the other two. Since maybe you do not want that to happen (the two you dialed to be joined together) telco has chosen to block CW for that limited period of time. Let us know. PAT] ------------------------------ From: joel@wam.umd.edu (Joel M. Hoffman) Subject: Someone Has Tapped My Line - Help Date: Mon, 10 Jan 1994 18:40:12 GMT Organization: Excelsior Computer Services Two hours ago, I heard a clear conversation on my line. I live alone, and have no extensions, so someone else is using my line. I called the phone company to try to get information (on another line) and tried to get information about the call, but they told me that local calls are not recorded. The technician tells me my line is connected to a 5ESS. Am I correct in assuming that the phone company can access that information, but that they're choosing not to? Does anyone else have experience with this, and perhaps advise they can offer? Many thanks. Joel (joel@wam.umd.edu) [TELECOM Digest Editor's Note: One of four things is happening: Assuming the worst, someone did 'borrow' (or is 'borrowing') your line. Telco won't know about that immediatly until/unless a technician or outside plant auditor specifically comes out and looks around. Check your bill when it comes for calls you did not make which appear to be direct- dialed or an unusually high number of local calls which you feel sure you did not make. The second case would be where someone in your area got new service and telco did accidentally put them on your pair of wires due to errors in the outside plant records as to what pairs were available for use, etc. In either case, telco will make the required adjustments in billing and service (who gets which wire pair, etc) when the matter is brought to their attention. In the third case, a very temporary fluke or bug or programming error caused the ESS to misbehave for a few minutes. Again, telco will make required adjustments, but actually catching this while it is happening so that it can be traced and corrected will be difficult. In the last scenario, there may have been 'crosstalk', a condition which occurs when wires get wet or are otherwise quite conducive to each other in the cable or at a junction point in a conduit/underground crawl space in the street, etc. You did not say if you were able to participate in the spurious conversation or not (or if you chose not to). In the first two cases above, you *could* have participated should you chose to do so. In the third and fourth case, it is unlikely you would have been heard by the other people had you chosen to speak up. In the case of crosstalk due to intermittant shorts and grounds on your line due to damaged or wet cable, normally what you hear is several conversations going on at one time, none of which are distinct enough to be understood although one might stand out and have reasonable clarity. It could also be that a phone technician was working in the area on a telephone pole somewhere nearby and chose to make a call to his office using your line. That happens occassionally. In order to make an an effective judgment call on this, we need a bit more history and background. Yes, the numbers dialed on local calls are recorded by the ESS, but it is a mess trying to find the record on the microfilm at the end of the billing cycle and anyway, this may have nothing more than crosstalk or a temporary glitch in the ESS. Followup on this for a couple weeks or so and let us know in more detail exactly what you are hearing if you hear it again; if you can speak to the party 'using your line' etc. PAT] ------------------------------ Date: Mon, 10 Jan 1994 10:15:01 PST From: Les Reeves Subject: Possible Internet Service Scam ---------- Forwarded message ---------- Date: Thu, 06 Jan 1994 10:18:48 -0500 (EST) From: Melinda Massi (MHM0) To: Multiple recipients of list TECHWR-L Subject: warning: possible Internet scam If you are contemplating a private Internet account, read the following and be alert. Washington, DC, may not be the only place where this is happening. -- M. Massi ---------------------------- Text of forwarded message > Date: Tue, 4 Jan 1994 16:18:44 -0500 > From: Scott A. Ward 703-614-4719 > To: Multiple recipients of list COMMUNET > Subject: Warning: International Internet Association A company calling itself the International Internet Association, and billing itself as "the largest non-profit provider of free Internet access in the world" has started advertizing in the Washington, D.C. area, and offering free Internet accounts to individuals who will FAX them, among other things, a credit card number. As an active member of the Member Council of the National Capital Area Public Access Network (CapAccess), I wanted to find more about this organization that supposedly has offices NOT THREE BLOCKS FROM CAPACCESS. Here's the result of my search for the IIA. 1. Their address, listed as "Suite 852 - 202 Pennsylvania Ave, N.W. Washington D.C. 20006", is actually a post office box at Mailboxes, Etc. 2. The company lists no incorporation, trademark or service-mark licenses. 3. They claim your E-mail address would be @iia.org. However: a. No iia.org is listed in the hq.af.mil hosts table b. No iia.org is listed in the acq.osd.mil hosts table c. No iia.org is listed is the INTERNIC 'whois' database d. No iia.org is listed using the INTERNIC 'netfind' Internet lookup In other words, IIA.ORG does NOT, at this time, exist. 4. Although they apologize profusely in the application, they state that "Without receiving a credit card number, the IIA _cannot_ process an account." 5. Although I have left a message on their voice-mail system, I have received no response from them. (They also apologize in the voice mail that, due to demand, they are operating at a three-week backlog for applications.) I cannot judge an organization in advance. However, I do think it highly suspicious that, to use their propaganda, "The International Internet Association is able to make this service available through generous private donations, and the extraordinary dedication of its membership." I can say that I am not convinced this organization exists, and highly discourage any Internet user from sending information until you make certain that the IIA is real. ------------------------------ Date: Mon, 10 Jan 1994 18:29:11 EST From: "Paul R. Coen" Subject: NYTel/NYNEX Dusts Off Rotary Payphones Organization: Drew University Academic Technology Yup, that's right. The return of the pulse-dial, rotary, bleed to death while dialing 9-1-1 payphone. Some neighborhoods have gotten tired of the drug dealers and the "corner office" by the payphone. Seems that a lot of them use the touch-tone payphones to access the beepers of their associates. So, under pressure from local groups, New Yor..., uh, I mean NYNEX, decided to put in the old rotary payphones. I'm sure it broke their heart to find a use for all this old equipment, and to put the touch tone equipment somewhere else. They apparantly tried this in one or two areas already, and it did cut down on the number of people hanging around by the phones on corners. However, in some of the new areas, touch-tone phones are as close as across the street from the "new" rotary phones. A NYNEX official was shown on the local news (WABC, channel 7) saying that these phones "couldn't" be used to trigger a pager. Gee, and DTMF tone generators are so hard to come by. If they make it hard enough to walk to a different phone, the dealers with half a clue will just pick one up. Hell, it isn't like they don't have telephone-savvy people involved -- look at all the cellphone ID modification going on in NYC. This doesn't stop cellphones, either. They did mention, however, future plans to expand blocking. Currently, a lot of these phones apparantly can't accept incoming calls, and NYNEX is talking about expanding this to prevent calls from going out to pager numbers. I wonder how long it will be before the drug dealers just let themselves into buildings and start attaching new wiring to pairs? A lot of the older buildings have tons of exposed wiring and screw-down connections in the hallways and basements. Seems like they're just expanding the incentive to commit cellular fraud as well. Not that I think it shouldn't be done at all, I just think it isn't going to make that big a difference. [TELECOM Digest Editor's Note: The return to rotary dial plus 'calling card, collect or third party billing after dark' seem to be the two principal ways the neighborhood people are convincing telco to help in the 'war on drugs'. Many payphones in Chicago have the latter option on them, meaning coins are not accepted as payment between about 8 PM and 4 AM daily. This causes a more reliable paper trail to exist should someone want to seek it out and prove a point as to who called whom at what time. A third option, and the one which seems to me to be a little more fair to everyone concerned is to fix the phone for no incoming service, although customers of drug dealers could still make outgoing pages and transmit messages to dealers other than to be called back at the payphone they are using. Everyone seems to love the war on drugs as it is quite profitable for all concerned: telcos, governments, police departments -- all are getting extra money from it. PAT] ------------------------------ Date: Mon, 10 Jan 94 13:18 EST From: Proctor & Associates <0003991080@mcimail.com> Subject: Network Outage in 205 NPA? Anyone know what happened with the telephone network in Alabama on Monday? I got a call from a customer in Arab, and I get an all-circuits-busy when trying to return his call on all AT&T, Sprint and MCI. Did BellSouth lose a tandem switch? Paul Cook 206-881-7000 Proctor & Associates MCI Mail 399-1080 15050 NE 36th St. fax: 206-885-3282 Redmond, WA 98052-5378 3991080@mcimail.com ------------------------------ From: sp9183@swuts.sbc.com (Scott M. Pfeffer) Subject: Truckstop Calling Cards Date: 11 Jan 94 05:00:45 GMT Organization: Southwestern Bell Telephone Company Recently I was traveling home from Atlanta to St. Louis. I stopped at a gas station somewhere in Tennessee or Kentucky for refreshments, refilling, and relief, and noticed something very interesting in a business card holder near the convenience store cash register -- a stack of pre-authorized long distance calling cards. I inquired of the cashier. The cards cost $10 for 20 minutes of long distance, or $20 for 40 minutes of long distance. Instructions on the card indicated a toll-free number you could call that would enable you to see how much your card had left, in minutes. This card is printed on paper (as opposed to plastic), and requires no identification or registration to purchase, since the life of the card is based on your pre-paid purchse. The cashier told me the major selling point, that now, if you lost this card, you were only out the amount left on the card. "Great for travelling!" I didn't buy. (Although it would have been interesting to attempt to call overseas with this card, if it let me.) Scott [TELECOM Digest Editor's Note: Those are called 'Talk Tickets' and they are a bit expensive at 50 cents per minute of domestic use although you can get that down to about 35 cents per minute with quantity pur- chases of the ticket from the wholesalers of same. Yes you can make international calls also but instead of 20 minutes for ten dollars you wind up getting about five minutes. To be a wholesaler of Talk Tickets you plunk down $1850 for $2500 in tickets of assorted denominations. That gets you a 25 percent discount off the 50 cent per minute rate, or about 35 cents per minute of use. If you then resell these to truck stops or convenience stores, etc you split the commission with them by selling them the tickets for around $2200; they in turn sell to their customers at the face value. Western Union also has prepaid calling cards like this at a similar rate. Personally, I prefer the Orange Card with its 25 cent per minute rate and no surcharge. PAT] ------------------------------ From: velu@pix.com (Velu Sinha) Subject: Cell Phone Charges: Can You Pay With a Calling Card? Organization: Pix -- The company with no adult supervision. Date: Mon, 10 Jan 1994 15:07:53 GMT Are there any cellular service providors out there who are able to bill your fixed monthly fees along with usage and roaming charges to a calling card (AT&T)? (Instead of sending you a bill that you need to pay by check or whatever ...) I notice that the new generation of cellular phones in Hertz rental cars allow you to swipe your AT&T calling card for payment. The older generation phones require a Visa/MC/Amex and perhaps Discover or CB. But I haven't gotten any informed response from either Cellular One or Bell Atlantic Mobile in the DC area on this matter. (I know that you can charge the toll portion of any call made from a cell phone by dialing in the standard 0+ or 10XXX0+ fashion, but the roaming and access charges still seem to wind up on your monthly bill!) ------------------------------ From: Willie Smith Subject: Touch-Tone Dial Pads? Date: Mon, 10 Jan 94 10:18:53 EDT I've got a couple of the old-style Bell (WE?) 2500 touch-tone phones that I bought from the Telco after renting them that are having troubles dialing. Some of the row and collumn switches are kinda 'mushy' and make intermittent contact, so I'm not making real Touch-Tones. Is there a way to clean these, tighten the switches, or just buy new TT pads? Any hints on cleaning or pointers to suppliers of the real full-travel (not the newer style hinged button) TT pads would be greatly appreciated! Willie Smith wpns@pictel.com N1JBJ@amsat.org ------------------------------ Date: Mon, 10 Jan 94 10:50 EST From: Susan Sirmai <0003188677@mcimail.com> Subject: Re: SW-56 and ISDN Questions Global ISDN is becoming a very hot topic these days as companies continue to go global and applications such as videoconferencing, batch file transfer and G-4 fax continue to grow. I will provide you the answers to your questions from an overall and MCI perspective. > 1. Which countries/provinces have SW-56 service and are ISDN capable? Today over 20 countries around the world currently have some level of ISDN service. The number is growing as domestic networks are upgraded and advanced signalling is implemented between the overseas carriers and the domestic US carriers. In most countries, the network operates at a 64 kbps level and is accessed using BRI (2B+D) or PRI (30B+D). 56 kbps connectivity can be achieved with the use of a terminal adapter for rate adaption which is marketed by several companies in the US and overseas. MCI International 64 Service currently provides switched digital connectivity to Canada and most of the European and Pacific Carriers capable of providing the service today. Current MCI Tariffed Countries include: Australia, Belgium, Canada, Denmark, Finland, France, Ireland, Italy, Japan (IDC, ITJ, KDD), New Zealand, Netherlands, Norway, Singapore, Sweden, Switzerland, Taiwan, United Kingdom. Additional countries are planned for 1994. > 2. Here in the US what cities have been converted to ISDN, and who are > still operating at SW-56? Availability depends on the local exchange carrier. There is a document published by Bellcore that lists most of the exchanges that are capable of providing the service. You should contact your local LEC provider or your local MCI representative to assist you with evaluating a specific location in your area since the list changes and either source could provide you with up to date information. > 3. If you know, who are their carriers? Service is provided locally by the US Local Exchange Carriers and interexchange and internationally by the interexchange carriers offering the service. The carriers in-country overseas are the PTTs or ITOs who provide local and/or international service. Please contact your local MCI rep or me by phone at 1-703-903-1033 or fax at 1-703-506-6626 if you have any additional questions. Regards, Susan Sirmai MCI Global Marketing ------------------------------ Date: Mon, 10 Jan 1994 23:21:15 EST From: Randy te Velde Subject: Oracle and Bell Atlantic ADSL Service The {New York Times} reports today that Oracle and Bell Atlantic will offer interactive broadband services to the home in the "DC area" using ADSL over copper wire. The Times anticipates a Wednesday announcement by the companies involved. According to this report, work will begin on the service "before the end of 1994" and will offer "movies as well as other interactive services". randy ------------------------------ Date: Mon, 10 Jan 94 21:50:47 EST From: Alec Isaacson Subject: Inquiring Minds Want to Know This evening in Cincinnati Bell-land I had a lot of trouble getting making phone calls. Each time I tried to make a call, I got a "fast busy" reorder. After a bunch of attempts I called the repair people and they said there was "central office trouble", but had no details. Now, being a dilligent TELECOM Digest reader, I'm more than a little interested in knowing more details. I have heard that telephone companies have to report outages, but I don't know to who. Bottom line is, I'm interested in finding out what happend, but don't know who to ask. I'd appreciate some pointers from those who know. Oh, for the record, I'm in (513) 829- Thanks for the help. Alec D. Isaacson AI4CPHYW@miamiu.acs.muohio.edu Miami University, Oxford, OH ------------------------------ From: jspinnow@netcom.com (John Stewart Pinnow) Subject: 50 Pin Connector Help Wanted Organization: Tmoh Research, Milwaukee, WI Date: Mon, 10 Jan 1994 22:53:16 GMT A 50 pin connector. Used for a phone system. What are the pin layouts for it? Does anyone have a description? Tmoh Research Internet: jspinnow@netcom.com Phone: (414) 761-1537 John S. Pinnow jspinnow@world.std.com Disclaim: Opinions==Mine ------------------------------ From: dej@eecg.toronto.edu (David Jones) Subject: Phone Line Simulator Wanted Organization: Department of Electrical and Computer Engineering, U of Toronto Date: Mon, 10 Jan 1994 15:25:15 -0500 I am in need of a phone line simulator. It will be used to verify the functionality of modems for a large computing network. This device need not be complex -- I need dial tone, DTMF detection, ring signal generation and an analog path whose noise characteristics approximate that of a real phone line (i.e. 3300 Hz BW, -34 dB S/N). Any ideas as to where I can get one cheap? Even used? David Jones, M.A.Sc student, Electronics Group (VLSI), University of Toronto email: dej@eecg.utoronto.ca, finger for more info/PGP public key ------------------------------ Date: Mon, 10 Jan 94 09:27:59 EST From: Bob Rankin Subject: Distinctive Ringing and Ring Detectors Just saw an ad for a gizmo that will decipher the unique ringing cadence for up to four lines and route them to a specified telephone device. Using this device ($75) along with distinctive ringing ($6/mo) sounds like a wonderful alternative to having separate lines installed for fax, modem, answering machines, etc. Kinda like a poor man's DID! Anyone have any experience with these devices? Any drawbacks? Bob Rankin (r3@vnet.ibm.com) [TELECOM Digest Editor's Note: The only drawback to distinctive ringing and/or call-waiting is that you still only have one phone line instead of two (or three or four), and as long as there is no possibility two or more of the devices (or human persons) will want to be on the phone at the same time everything is fine. As soon as two people or devices need to be on the phone at the same time, everything falls apart. I can see and justify a single distinctive ringing number so that two things share one line if neither is used a lot. But when you are talking three or four distinctive rings for that many end 'users' to share, unless none of them get any real volume of calls there will always be someone or something getting a busy signal in a conflict with the others. PAT] ------------------------------ Date: Mon, 10 Jan 1994 18:13:27 -0700 From: David Appell Subject: New ATTmail Charges I received the following message in my January bill for AT&T Mail: "Due to increasing costs associated with the delivery of messages received from the Internet, AT&T Easklink Services will implement a new inbound Internet pricing structure beginning Feb. 1, 1994. All Internet messages received will be charged at the following rates: 0 to 1,000 characters $0.15 Each additional one thousand characters (or portion thereof) will be charged at $0.02. Looks like it's time to find another Internet provider -- the quality of their service doesn't warrant anything near that, IMO. David Appell appell@csn.org [TELECOM Digest Editor's Note: That means a typical issue of this Digest will cost each recipient via ATTMail about 50-60 cents. My calculations are 2 cents per K times 22K = 44 cents plus 1 K at 15 cents. Too bad. :( PAT] ------------------------------ End of TELECOM Digest V14 #24 ***************************** ****************************************************************************** Downloaded From P-80 International Information Systems 304-744-2253