randyrossi / fisher-modem Goto Github PK

Hi Randy,

we've been working hard to make this VoIP wardialer https://github.com/x25today/voipwardialer, that proven like a challenge in the making a VoIP modem that negotiate very low carrier (v21 300bps would be fine).

It would be very nice if we could work on hooking fisher-modem integrating it for it's use on Linux and Python 3.0

Are you already currently emulating a Linux pty creating the device for I/O of the modem/demulated data?

How could we pass to a fisher-modem the audio PCM samples that we receive at application level from VoIP?

How could we have notifications of negotiated speed-mode?

Definitively, if you like VoIP wardialer mode and are willing to help, we could get the fisher-modem back in use in 2020 for a 2020 project :)

Currently, one must use obscure AT commands to set the modem to different speeds. For example, to use 9600 bps, one types AT+MS=9,1. It would be swell if modem allowed a user to type something like

modem --2400

to use V.22 bis (2400 baud)

According to his man page, Fisher's original modem program exits when ^D (control-D) is sent. However, this revised version has to be killed with SIGHUP from a different terminal. (pkill -1 modem)

Please add the ability for the user to exit the program. I am not sure what would be best, but here's an idea:

• If in command mode (not connected), allow ^D (EOF), ^C (sigint), and ^\ (sigquit) to close the modem program.
• If in data mode (connected, e.g., after "ATA"), then let user return to command mode by typing pause +++ pause .

Please see the description of the Heatherington '302 in https://en.wikipedia.org/wiki/Time_Independent_Escape_Sequence for information on how the +++ escape sequence worked only when typed by a human, not when uploading files.

Is it possible the could be rewritten to use PortAudio Or PulseAudio instead of Alsa?
It would be greatly appreciated!

I've sent a pull request so that modem will use the default ALSA sound device. While this is good, it is not sufficient. There should be a way for a user to specify the ALSA sound device from the command line. For example,

modem -D devicename

It would also be nice to be able to specify an audio file instead of an audio device for input. For example, I want to decode an audio file of a modem (in originate mode). I wish I could type something like, modem --audio-file-in recording.wav .