Return-Path: Received: by massis.lcs.mit.edu (8.7.4/NSCS-1.0S) id QAA09707; Wed, 25 Mar 1998 16:53:20 -0500 (EST) Date: Wed, 25 Mar 1998 16:53:20 -0500 (EST) From: editor@telecom-digest.org Message-Id: <199803252153.QAA09707@massis.lcs.mit.edu> To: ptownson Subject: TELECOM Digest V18 #45 TELECOM Digest Wed, 25 Mar 98 16:53:00 EST Volume 18 : Issue 45 Inside This Issue: Editor: Patrick A. Townson Integrated Management '99 Call For Papers (Nikos Anerousis) 877 - Roll-Out, or Delay? (Judith Oppenheimer) EXPO COMM and COMDEX/Spring Coming to Chicago (Bill Sell) Concerns About the Growth of World Phone Penetration (Dave Penkler) Emergency Wireless Phones (Dale Laluk) Hunting Down the Source of an Intercept (John Waters) CNID Question (Clifton T. Sharp Jr.) Telephone Acoustic Interface (Miguel Garcia) 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 America On Line. It is also gatewayed to Usenet where it appears as the moderated newsgroup 'comp.dcom.telecom'. Subscriptions are available to qualified organizations and individual readers. Write and tell us how you qualify: * telecom-request@telecom-digest.org * The Digest is edited, published and compilation-copyrighted by Patrick Townson of Skokie, Illinois USA. You can reach us by postal mail, fax or phone at: Post Office Box 4621 Skokie, IL USA 60076 Phone: 847-727-5427 Fax: 773-539-4630 ** Article submission address: editor@telecom-digest.org ** Our archives are available for your review/research. 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Please make at least a single donation to cover the cost of processing your name to the mailing list. All opinions expressed herein are deemed to be those of the author. Any organizations listed are for identification purposes only and messages should not be considered any official expression by the organization. ---------------------------------------------------------------------- From: Nikos Anerousis Subject: Integrated Management '99 Call For Papers Organization: AT&T Labs Research, Florham Park, NJ Date: Tue, 24 Mar 1998 19:00:55 GMT IFIP/IEEE INTERNATIONAL SYMPOSIUM ON INTEGRATED NETWORK MANAGEMENT C A L L F O R P A R T I C I P A T I O N Boston Park Plaza Hotel Boston, Mass., USA May 10-14, 1999 "DISTRIBUTED MANAGEMENT FOR THE NETWORKED MILLENNIUM" See http://www.comsoc.org/confs/im/99 for latest information The Sixth IFIP/IEEE International Symposium on Integrated Network Management (IM '99) will be held May 10-14, 1999 in Boston, Massachusetts, USA. The symposium is sponsored by the International Federation for Information Processing (IFIP) Working Group 6.6 on Network Management for Communication Networks, and by the IEEE Communications Society Technical Committee on Network Operations and Management (CNOM). The sixth in a distinguished series, IM '99 will build upon the successes of ISINM '89, '91, '93, '95 and IM '97 in serving as the primary forum for technical exchange for the research, standards, development, systems integrator, vendor and user communities in the area of network and distributed systems management. The next millennium will be a network age with ubiquitous network access from, work, home, schools, libraries and public information kiosks. Portable networked computers will be widespread permitting communication and multi-media interaction, while on the move. The wide distribution of computing and communication facilities between organisational boundaries and multiple countries will introduce many new management challenges. Management in this new information era will need to support the integration of data and telecommunications networks, from narrowband to broadband, terrestrial to satellite, fixed to mobile and uni-media to multi-media. The next symposium is expected to provide a shift of emphasis towards electronic commerce, federated systems, and end-to-end management of distributed services. This symposia is the premier biannual event where the latest research and industrial solutions for integrated management of networks and distributed systems are presented in technical sessions and vendor exhibits. We intend to introduce a new track of industrial experience to permit the sharing of the lessons learnt from case studies by the user or vendor community. The IM '99 symposium will be organized to provide the highest quality professional event of the year through active participation on the Program Committee of many of the most respected people in the fields of network and distributed systems management, and a stringent review process. A limited number of stipends will be available to those unable to obtain funding to attend the conference. Students whose papers are accepted and who will present the paper themselves are encouraged to apply if such assistance is needed. Requests for stipends should be addressed to the Program Co-Chair responsible for the requestor's region. Please also note that a limited number of IEEE Student Travel Grants may be available for student authors from *outside North America* who will be presenting papers. TECHNICAL PROGRAM Authors are invited to submit unpublished papers, as well as proposals for tutorials, panel discussions, poster demonstrations, or birds-of-a-feather sessions (informal discussion groups) in the following topic areas. Other topics relevant to management are also welcome and we particularly encourage industrial papers on case studies and experiences which emphasise the lessons learnt. - Distributed Systems and Applications Management - New Enabling Management Platforms (CORBA, DCOM, Java,etc.) - Using the Web for Management - Management Tools and Applications - Integration of Network Control and Management - Network Design Tools and Capacity Planning - Active Network Management - Intelligent Agent Technology - Interoperability and Cooperative Control - Management of the Internet, Intranets and the Web - Management of Electronic Commerce - Management of Mobile Systems and Networks - Personal Communications Services Management - Multimedia and Telecommunication Service Management - Information Models - Policy-Driven Management - Monitoring, Event and Fault Handling - Quality of Service Management - Security Management - Open Network Control - Standards Frameworks and Issues: OSI, SNMP, TMN, TINA, ODP etc. - Case Studies and Experiences - User and Service Profile Management - Human Factors, User Interfaces and Virtual Reality for Management Papers are to be submitted in English. The cover page should indicate whether it is a research or experiences paper; and include paper title, brief abstract, list of key-words, author(s) full name(s), affiliation(s) and complete address(es), telephone number(s) and electronic mail address(es). All paper submissions will be carefully reviewed by at least three international experts and returned to the author(s) with comments to ensure high quality. The authors of accepted papers will receive the suggested modifications for inclusion in the widely distributed, hard-bound Symposium Proceedings. The final camera-ready copy should be no longer than 12 single-spaced pages. Final papers arriving too late will be removed from the program. The authors of accepted papers must guarantee that their paper will be presented at the symposium. SUBMISSION INSTRUCTIONS The front page of the paper should contain author names and addresses, an abstract and keywords indicating the paper topic area (preferably from the above list), to be used in choosing referees. ELECTRONIC SUBMISSION IS ADVISABLE. Authors are requested to submit papers in PDF or postscript format via the web (instructions for electronic submissions are available at) http://nsm.research.bell-labs.com/~im99/SubmitPaper.html or by email to Subrata Mazumdar at mazum@research.bell-labs.com. For ALL electronic submissions the cover page of the paper should be submitted using the on-line form available at http://nsm.research.bell-labs.com/~im99/SubmitPaper.html and and a printed copy posted to the appropriate Program Co-Chair. Program Co-Chair: (Americas, Australia) Subrata Mazumdar Bell Laboratories Room 4G-634 101 Crawfords Corner Road Holmdel, New Jersey 07733-3030, USA Email: mazum@research.bell-labs.com OR Program Co-Chair: (Europe, Asia, Africa) Morris Sloman Department of Computing Imperial College of Science and Technology 180 Queen's Gate London SW7 2BZ, UK Email: mss@doc.ic.ac.uk Deadline for Receipt of Papers: July 1, 1998 Deadline for Receipt of Proposals for Tutorials, BOFs, Panels and Posters August 15, 1998 Notification of Acceptance Mailed: November 4, 1998 Final Camera Ready Papers Due: December 12, 1998 Poster presentations should be submitted to either of the Program Co-Chairs. VENDOR PROGRAM The Symposium offers vendors the opportunity to demonstrate their network and systems management products to leaders and innovators from around the world. Various levels of participation are available. As a Symposia Patron, you can present your products and services in our vendor showcase. Symposia Patrons will also have an opportunity to make a product-related presentation on recent technical advancements, product enhancements, or corporate directions. The vendor showcase will be open during the three days, of the symposium, in parallel with other sessions. For IM '99 we are adding a lower cost vendor participation level designed for smaller companies with innovative technologies. Cost will be saved through time- shared demonstration facilities and displays. Vendors interested in becoming Symposium Sponsors or participating in the showcase should contact the vendor Co-Chairs: Mark Sylor Email: sylor@concord.com Phone: 1-508-303-4262 Joe Hellerstein Email: jlh@watson.ibm.com Phone: +1 914 784 7506 TUTORIALS The symposium includes tutorials on the days before and after the technical program. A proposal to present a tutorial should contain the following information: Tutorial Title Names of Presenter(s) Summary of the contents: approximately 1-2 pages i.e. 500-1000 words Brief biography of the presenter(s): approximately half page If the tutorial or an earlier version of it has been given before please indicate the events and dates. Information on suggested topic areas and guidelines for submitting proposals can be found at http://www.ctr.columbia.edu/im99/tutorials. Proposals should be submitted to the Tutorial Chair: Rolf Stadler Email: stadler@ctr.columbia.edu Deadline for Receipt of Proposals: August 15, 1998 PANELS AND BIRDS-OF-A-FEATHER SESSIONS Proposals for Panels and Birds-of-a-Feather Sessions should be submitted to the Special Event Chair Varoozh Harikian Email: varoozh@vnet.ibm.com Deadline for Receipt of Proposals August 15, 1998 ORGANIZING COMMITTEE General Chair: Seraphin B. Calo (SBC) IBM Research Division Thomas J. Watson Research Center P.O. Box 704 Yorktown Heights, NY 10598, USA Email: scalo@us.ibm.com Tel: +1 914 784 7514 Fax: +1 914 784 6031 Technical Program Co-Chairs: Subrata Mazumdar, Bell Laboratories, USA Morris Sloman, Imperial College, UK Vendor Co-Chairs: Mark Sylor, Concord Communications, USA Joe Hellerstein, IBM T.J. Watson Research Center, USA Tutorial Program Chair: Rolf Stadler, Columbia University, USA Finance Chair: Yvonne Hildebrand, Copper Mountain Networks, USA Special Events Chair: Varoozh Harikian, IBM International Education Centre, Belgium Publicity: Nikos Anerousis, AT&T, USA Local Arrangements: TBD IEEE/ComSoc Coordinator: Tom Stevenson, IEEE Communications Society, USA STEERING COMMITTEE: Branislav Meandzija, Next Level Systems, USA Wolfgang Zimmer, GMD FIRST, Germany Doug Zuckerman, Bellcore, USA ADVISORY BOARD: Roberto Saracco, CSELT, Italy Makoto Yoshida, NTT-AT, Japan Jim Herman, Northeast Consulting Resources, USA Ken Lutz, Bellcore, USA PROGRAM COMMITTEE: Salah Aidarous, NEC, USA Anindo Banerjea,University of Toronto, Canada Subodh Bapat, Sun Microsystems, USA, Joseph Betser, Aerospace Corp., USA Jit Biswas, ISS, Singapore Laura Cerchio, CSELT, Italy Fawzi Daoud, University of Toronto, Canada William Donnelly, Waterford Institute of Technology, Ireland Gabi Dreo-Rodosek, Leibniz Supercomputing Center, Germany Masayoshi Ejiri, Fujitsu, Japan Metin Feridun, IBM Zurich Research Laboratory, Switzerland Kurt Geihs, University of Frankfurt, Germany German Goldszmidt, IBM T.J. Watson Research Center, USA Gita Gopal, HP Labs, USA Shri Goyal, GTE Labs, USA Sigmund Handelman, IBM T.J. Watson Research Center, USA Masum Hasan, Lucent Bell Labs, USA Heinz-Gerd Hegering, University of Munich, Germany James Hong, POSTECH, Korea Gabriel Jakobson, GTE Labs,USA Gautam Kar, IBM Global Services, USA Irene Katzela, University of Toronto, Canada Wolfgang Kleinoeder, IBM Zurich Research Laboratory, Switzerland Aurel Lazar, Columbia University, USA Emil Lupu, Imperial College, UK Manu Malek, Lucent Bell Labs, USA Joe Martinka, HP Labs, USA George Mouradian, AT&T Labs, USA Shoichiro Nakai, NEC, Japan Giovanni Pacifici, IBM, USA Jong Tae Park, Kyungpook National University, Korea George Pavlou, University College London, UK Pradeep Ray, University of Western Sydney, Australia Jan Roos, University of Pretoria, South Africa Veli Sahin, SAMSUNG Telecommunications, USA Juergen Schoenwaelder, Technical University Braunschweig, Germany Adarshpal Sethi, University of Delaware, USA Cheenu Srinivasan, Lucent Bell Labs, USA Binay Sugla, Lucent Bell Labs, USA Liba Svobodova, IBM Zurich Research Laboratory, Switzerland Simon Towers, Microsoft, USA Fabienne Vincent-Franc, CNES, France Carlos Westphall, Federal University of Santa Catarina, Brasil Felix Wu, NC State University, USA Yechiam Yemini, Columbia University, USA ------------------------------ Date: Tue, 24 Mar 1998 10:27:45 -0500 From: Judith Oppenheimer Reply-To: joppenheimer@icbtollfree.com Organization: ICB TOLL FREE NEWS. 15 Day FREE Trial: http://icbtollfree.com Subject: 877 - Roll-Out, or Delay? LEVEL THE PLAYING FIELD Congressional leaders tell the FCC, "Vanity numbers are extraordinarily valuable marketing tools for large and small businesses alike...", "Large carriers are RespOrgs, SNAC members, and subscribers... There exists a fundamental conflict of interest in the roles [they] have in the toll free industry." Washington, D.C. U.S. - (ICB TOLL FREE NEWS) Prompted by local centers with concerns for call centers and 800 users nationwide, Maine's Congressional representatives: Senators Olympia J. Snowe and Susan M. Collins, and Representatives John E. Baldacci and Tom Allen, have each written to the Commissioner William E. Kennard, calling for greater FCC consideration of toll free user rights -- and better toll free resource management -- in advance of the introduction of 877. Referring to Steve White, President of The New England 800 Company, a Maine call center, Senator Snowe writes, "The New England 800 Company is concerned primarily about the consumer confusion, misdials, and erosion of trademarks that could result from opening up additional toll-free service access codes... this is a matter of urgent importance not only to the New England 800 Company, but to many other call center companies nationwide." Senator Collins brings Mr. Kennard's attention to issues raised by the Small Business Administration in its ex parte to the FCC, which also asked for delay in 877 roll-out. "My principal concern with the proposed rollout," she writes, "is that a business that has invested heavily to develop a highly recognizable toll free number under the 800 and 888 service access codes may be materially harmed if the same number is assigned to another subscriber under the 877 service access code." Fundamental Conflict of Interest "The SBA has also raised a number of potential problems with the Commission's order dealing with the brokering and hoarding of toll free numbers ... Finally, allowing the system to be administered by the toll free carriers does seem, in its face, to hold the potential for a conflict of interest, as the SBA contents," says Senator Collins. Representative Baldacci also expressed concerns about this issue. "There exists a fundamental conflict of interest in the roles that large carriers have in the toll free industry," he says. "Large carriers are RespOrgs, SNAC members, and subscribers. Certainly, large carriers have an inordinate amount of control over the policy for 8XX subscribers and access to those numbers." The Value of Vanity Numbers He goes on, "The 'vanity' number and replication issues have not yet been resolved. There exists no clear definition for 'vanity' numbers. Vanity numbers are extraordinarily valuable marketing tools for large and small businesses alike. Before further complicating the issue with the 877 SAC, this issue must be resolved." Specifically, Representative Baldacci points out, "there is a need to examine how to have a more level playing field for small entities. I urge the FCC to consider a delay of 30 to 60 days to look into these matters." Representative Tom Allen also expressed concerns that the commercial value of existing 800 numbers would be jeopardized, and that small businesses would have limited access to new toll free numbers. Brief but eloquent, Mr. Allen recommends that the FCC "... preserve the utility of an 800 number as a marketing tool." Doesn't seem like too much to ask, does it. Judith Oppenheimer, Publisher ICB TOLL FREE NEWS The Daily News Service of the Toll Free Industry 15-day, no-obligation FREE trial: http://icbtollfree.com ------------------------------ From: Bill Sell Subject: EXPO COMM and COMDEX/Spring Coming to Chicago Date: Tue, 24 Mar 1998 12:09:36 -0500 EXPO COMM USA 98, together with COMDEX/Spring and WINDOWS WORLD, is the largest integrated event for communications and information technology solutions. These three co-located events take place April 20-23, in Chicago's McCormick Place. EXPO COMM USA will deliver the biggest names and latest solutions to Chicago this April, and has announced that heads of MCI, Sprint and CompuServe will headline the speaker program. Peter Van Camp, president of CompuServe Network Services; Bert C. Roberts, Jr., chairman of MCI Communications Corporation; and William T. Esrey, chairman and CEO of Sprint Communications are scheduled to keynote. The conference and exposition will provide the industry's most significant event focused on achieving business objectives in an Internet-enabled world. More than 100,000 computer and communications professionals are expected to attend the three tradeshows during their 4-day run at Chicago's McCormick Place, April 20-23, 1998. The combined exhibitors roster for COMDEX/Spring, WINDOWS WORLD and EXPO COMM USA includes such industry giants as: AT&T, Ameritech, Cisco Systems, CompuServe, Computer Associates, Dell, Digital Equipment, Gateway 2000, Hewlett-Packard, Intel, Lucent Technologies, Microsoft, Novell, Ricoh, SAS, Sprint, Tektronix and Unisys. Exhibition and keynote guest passes are free, if you register online before April 8. Further information and registration are online at http://events.comdex.com/cs98/expo.htm and enter the special Telecom Digest reader customer code of ECTM. ------------------------------ Subject: Concerns About the Growth of World Phone Penetration From: Dave Penkler Date: 24 Mar 1998 21:02:20 +0100 Dear Pat, In these days filled with the exuberant hype of the internet it is sobering to realise that half the world does not have a phone yet and that competition and deregulation might not be making it easier for them to get one. See "For Most, Phones Are Still Just a Rumor" at: http://www.wired.com/news/news/technology/story/11118.html This is also a preoccupation with the regluatory powers as witnessed in the recently published Chairman's Report of the ITU's seventh regulatory colloquim entitled " Transforming Economic Relationships in International Telecommunications". Here the issue of the inadequacy of the so called international accounting rate system was addressed. Increasingly international traffic is bypassing the accounting system as global alliances and local competition take effect. This in turn is having the effect of decreasing the income of incumbent operators in less developed and developing countries. (These countries generally terminate more traffic than they originate and therefore receive net settlement payments.) The international settlement rates, it is argued by some, notably the FCC are unreasonably high and bear no relationship to costs. Others argue that the settlements rates are essential to fund the build out the telecom network in the developing countries. The colloquim's main concern was "the need to preserve and expand telecommunications systems so as to meet the needs of all peoples at reasonable and affordable prices." The report analyses the forces of change, the impact of change and also a number of alternative solutions to adapting successfully to the new "single market" environment. I found it objective in outlook and a stimulating read, especially the briefing report by Michael Tyler. The full 99 page indexed ITU report can be found on their web server at: http://www.itu.int/itudoc/osg/colloq/chai_rep/sevencol/sevencol_43176.html I am very interested to hear the opinion of TELECOM Digest readers on this topic! For those who feel the need for a further palliative I can recommend the Gloomy Delights of Professor Ian Angell of the London School of Economics. See "Winners and Losers in the Information Age" at: http://www.csrc.lse.ac.uk/csrc/ang01.htm Here's a little snippet: '...a new order (which many will call disorder) is being forced upon an unsuspecting world by advances in telecommunications. The future is being born in the so-called information superhighways. Very soon these electronic telecommunication networks, covering the world via cable and satellite, will enable everyone in the world to "talk" to everyone else. We are entering a new elite cosmopolitan age. Global commerce will force through the construction of multi-media highways, and anyone bypassed by these highways faces ruin.' Cheers, Dave PENKLER | E-Mail: Dave_Penkler@grenoble.hp.com Telecom Business Unit | Hewlett-Packard France | Telephone: +33 (0)4 7614 1446 5 av R. Chanas - Eybens | Fax: +33 (0)4 7614 5323 38053 Grenoble Cedex 09 | GSM: +33 (0)6 0715 0256 FRANCE | [TELECOM Digest Editor's Note: The very first paragraph your article is well-worth repeating: about half the population of the world does have a telephone at all; most of those people have never even used one, let alone subscribe to service. Another twenty-five percent or so do have some form of phone service, but typically very crude, older- style equipment incapable of being upgraded without a complete replace- ment of the system now in place. I've received letters here in the past from people who have read the Digest and marveled at the extremely sophisticated telecom network over much or most of the United States which is totally unavailable to them in their locality. Such 'early' features of the modern system as call-waiting and call forwarding are still not available in parts of the USA where crossbar and stepper central offices still prevail. A large percentage of the public which could have better still chooses to stay with rotary dial and zero feat- ures on their line. People in some places in Europe, the old Soviet Union area, Africa, and elsewhere still put in requests for phone serv- ice then wait for years to get it. To the credit of the now defunct 'Bell System' which Judge Greene hated so much, things have still held together pretty well over the past decade since divestiture, but with the increasing trend toward even further deregulation I have to wonder how much longer we can expect to remain number one, and if indeed the large part of the world's population which is still phoneless will ever get to first base. PAT] ------------------------------ From: Dale Laluk Date: Tue, 24 Mar 1998 14:54:44 +0000 Subject: Emergency Wireless Phones Hi, I need to provide a solution to a college that is putting emergency telephones into thier various parking lots around the campus. There is lots of power outlets, but running telephone lines to the locations is going to be very expensive. Does anyone know of a wireless solution that would accept inputs from an emergency telephone? I know there are site-wide wireless telephone solution but they all seem to require a proprietary handset. I figure this way they can use it both for emergency phone and phones for the mtce. people at the same time. Dale Laluk, C.E.T. Lunar Communication Services P.O. Box 569, Hudson's Hope, B.C. V0C 1V0 250-783-5365 or 1-800-227-5912 voice 250-783-5790 fax lunarcom@netbistro.com internet ------------------------------ Date: Tue, 24 Mar 1998 07:48:52 -0500 From: John Waters Reply-To: jwaters@atitech.ca Organization: ATI Technologies Subject: Hunting Down the Source of an Intercept Hi Pat, We've been getting reports from customers who are try to contact us that they are hearing intercepts such as "We're sorry, your call did not go through. For assistance, please contact your customer service center. Thank you. PHOD3." This person is getting this message when he tries to dial either our Customer Support group or our Switchboard. Both are in the same NPA/NXX, and non-800 service. We are located in Thornhill, ON (just outside of Toronto). Does anybody out there know how to track down where this message originates? It is not one of our recordings. These are happening more and more, and I'm confused. Thanks for your help. John Waters Telecommunications Specialist ATI Technologies. [TELECOM Digest Editor's Note: I think you are going to need to take a survey of the customers who report this problem, then try to find something in common between them. Are they all in the same geographic area, or all served by the same long distance carrier? Were all of their complaints on the same day or about the same time? There may be some way to identify the switch by the letters and numbers given at the very end of the recorded message, but I do not know of any single reference to them all. PAT] ------------------------------ From: Clifton T. Sharp Jr. Subject: CNID Question Date: Wed, 25 Mar 1998 12:26:38 -0600 Organization: as little as possible Reply-To: clifto@megsinet.net My nephew calls me from Joliet West CO, and I'm in the Schiller Park CO 32 billing miles away (40 miles is supposed to be the breakover point where calls go to the IXC). What I can't figure out is that month after month, the delivered name alternates between "Illinois Call" and his name (most often the former). In my experience, "Illinois Call" comes from the IXC, but from what I know of the tariffs the IXC isn't *required* to enter the picture until there's 40 or more miles between COs. What giveth? +---------------------------------------------------------------------------+ | Cliff Sharp | Wanna know how to uninstall Microsoft Internet Explorer? | | WA9PDM | http://home.netscape.com/download/netscape_now.html | +---------------------------------------------------------------------------+ [TELECOM Digest Editor's Note: What may be occuring is that his call is sometimes routed one way and sometimes routed another. Maybe all the circuits on the most direct route between you are busy and the call is handed off to some nearby (to him, yet more than 40 miles away) central office which would cause the IXC to get involved. Even if some re-routing like this is taking place because now more than 40 miles is involved, my understanding is that the IXC would still not handle it since the 'natural' or 'normal' progress of the call would be of a lesser distance. In other words, the distance is measured in air miles, or 'as the crow flies' regardless of the actual miles involved taken as a result of the convenience to telco in routing the call as they did. But maybe the CO sending him north and the CO accepting his call for eventual delivery to you are in fact more than 40 miles apart and the two of them normally communicate only through an IXC and no one is bothering to communicate (to each CO) that really, the distance is much less, so his call is treated like any other that those two offices pass between themselves. PAT] ------------------------------ From: miguelgpbsantos@mail.telepac.pt (Miguel Garcia) Subject: Telephone Acoustic Interface Date: Tue, 24 Mar 1998 21:59:24 GMT Hi everybody, I'm developing a system which must communicate via telephone DTMF. As many people know there must be a licence to connect anything directly to the phone line in many countries such as mine. Because of that I decided to use an acoustic interface. It uses one microphone to receive voice, DTMF and to detect 400Hz signal (for call progress status indication), and a second microphone is used for ring detection (+- 3KHz in my telephone). A speaker is used to send pre-recorded voice and DTMF signals from the system. My problem is: Although the ring detection (3KHz from the second microphone) and 400Hz detection (from the first microphone) signals are both filtered by two 4th order band pass filter (tuned on their adequate frequencies) there are many frequencies in the natural environment that cross (or are equal to) those tuned frequencies. That way an interrupt request (to answer a call) can be falsely generated into the system by the ring detection subsystem. I think it will be worst in what concerns to the 400Hz detection because, for example, if the system wants to dial a number, it takes up the receiver with a controlled electromagnetic arm and it must to recognise a dialing tone trough the first microphone of +- 400Hz. The probability of confusion between this telephone sound and another sound with the same frequency that may be present at the same environment, at the same time, and captured by the microphone is high, so the system may interpret it as dialing tone when it isn't present. Of course it may misunderstand other telephone tones like ringing tone, engaged tone ... My question is: Have you any idea about any resolution of this problem? Please e-mail too. ------------------------------ End of TELECOM Digest V18 #45 *****************************