Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ncar!ames!elroy!jade!morris From: morris@jade.jpl.nasa.gov (Mike Morris) Newsgroups: comp.dcom.modems Subject: Re: Call waiting and modem!! Summary: Yes, there is a solution! Keywords: Call Waiting Modems ! Message-ID: <9998@elroy.Jpl.Nasa.Gov> Date: 7 Oct 88 04:20:31 GMT References: <8858@watdragon.waterloo.edu> Sender: news@elroy.Jpl.Nasa.Gov Reply-To: morris@jade.UUCP (Mike Morris) Organization: What, Me organized ? Lines: 51 In article <8858@watdragon.waterloo.edu> sjflim@trillium.waterloo.edu (SJF LIM) writes: > Long description of Call waiting deleted > > Until I've found >out that Calling waiting and modem cannot exist together. The problem is >when someone calls and I am using modem the telephone signal will disconnect >my modem from the phoneline. Is there anyway that I can by pass the Call >waiting feature or temperory disconnect this feature? Any input will be >helpful. There is actually a two-pronged approach to the problem. The first, and probably the best is to take advantage of the "call waiting defeat" option of the central office switch. Look in the front of your phone book (it's amazing how much info is there, once you look for it) and find the code for it - here in Pacific Bell (Los Angeles) it's *70. Modify your modem program dialing prefix from "ATDT" to "ATDT*70,". The comma pauses a moment for the "special function dial tone" to complete. The *70 tells the CO switch to disable call waiting FOR THIS ONE CALL. as soon as you hang up call waiting is re-enabled. The second prong is to change one of the modem S-registers. Register 10 is a "carrier dropout tolerance" value. I forget what I set it to, but it can be increased to "bridge" the duration of the call waiting beep. You may get a few words trashed (or a resent block in a file transfer), but you won't get disconnected. However the party calling you will think you aren't home (rings forever), rather than getting a busy. Note that S10 must be greater than S9. If S10 is set to 255 the modem will never disconnect. BTW, the duration of the pause caused by the comma in the "ATDT*70," string is controlled by the S8 register, which is defaulted to 2 seconds. > > SJF Lim. > Good luck, and let me know if any of this info is of any use. I spent 5 years putting in phone systems (and connecting modems to multi- line phones is NOT fun), and learned a few tricks. It's nice to be able to use help someone out once in a while. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #Include disclaimer.standard #Include quote.cute The opinions above probably do not even come close to those of my employer(s). US Snail: ...............UUCP: .........................Also: Mike Morris .............morris@Jade.JPL.NASA.gov ..... WA6ILQ P.O. Box 1130 Arcadia, Ca. 91006-1130