[Rxtx] Ring detection on modem is not working

[George H]

Thanks Mariusz for the explanation.

So I guess there is no way for me to escape this. The user has to
hangup the phone and I send ATH. I thought maybe there was a special
way to do it or something :) maybe I need a better telephone with
bluetooth control.

I just tried my modem on a machine with regular serial ports, the ring
indicator didn't work. I guess this modem just doesn't support it.

I'll have to be more careful next time in picking a proper and good modem.
--
George H
george.dma at gmail.com



On Tue, Mar 16, 2010 at 2:06 PM, M.Dec-Gazeta <mariusz.dec at gmail.com> wrote:
> Hi George
> [...]
> Also to hangup, sending ATH doesn't completely hangup the phone, I
> have to close the headset to get it fully closed. Is there a command
> that can fully close the line? kinda like press the hungup button for
> a few secs without putting down the head set?
>
>
> Try to understand pick-up and hang-up of the phone.
>
> It works so:
>
> Your line (when not in use) is completely open (very big resistance).
> If you pick up phone (or modem) you make the short-circuit on the line and
> you have to "pull" current from the line (value depends of  Telcom and
> country).
> Therefore and only from this event ("short circuit") tel exchange knows that
> you want to talk (except ISDN of course).
> If you have telephone and modem connected to one line parallely (only way to
> work for both devices), ther is no way to disconnect line making
> short-circuit off for one device only.
> WHY?  Because disconnecting means: remove "short-circuit" from the line.
> Regards
> Mariusz Dec
>
>
>
>