-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2010-08-01 23:58, Istvan Gabor wrote:
2010. július 30. 16:22 napon James Knott <james.knott@rogers.com> írta:
Istvan Gabor wrote:
2010. július 30. 12:15 napon Per Jessen<per@opensuse.org> írta:
Istvan Gabor wrote:
Hello:
I have a conventinal external serial line data/vioce/fax modem. Is it possible to make phone calls through the computer using this modem?
No, it isn't possible. The next obvious choice is VoIP, but a 56K modem is not enough.
No VoIP is involved here.
Well, probably I haven't made it clear. I don't want to use the modem to connect to the internet and make conversation through the net. I want to make conventional telephone call but instead of the handset (speaker and microphone) of the telephone I'd like to use my headset connected to the computer and use the modem to forward/receive the call (ie replace my telephone by modem+computer-headset).
My moden have two 3.5 jack type plugins labeled as mic and speaker.
Cristal clear :-)
I will check hylafax as Carlos suggested.
Thanks, and if you have any concrete idea, please let me know.
You have two possible methods. If the modem (not a soft-modem) is labeled as voice-modem{-fax} then the voice can be sent, both directions, over the rs232 cables, as a stream of digits from/to the computer to/from the modem, where it is converted to/from voice. What goes over the phone lines is plain voice (the electrical analog of voice, 3Khz bandwidth), not a 56 encoded digital signal. What software can be used for this in linux I do not know, but I remember it was mentioned in the hylafax documentation. Search for answerphone, perhaps. I repeat, to make it clear, that this is not related at all to VoIP, nor does it need a high speed modem. It is plain voice over POTS. It needs a modem that is labeled "voice" capable. <http://en.wikipedia.org/wiki/Voice_modem> It says there that the method is very limited. I did not know that. Now, the other method that you have available, is connecting an output of the sound card directly to the "mic" input of the modem, provided the signal levels is compatible. And the "out" of the modem goes to an input of the soundcard in the computer (or the other way round, check the manual). The you just adjust the mixer in the computer. This should be documented in the modem manual. Years ago, it was quite common in Windows, when you bought a modem, to get software that would handle this atumatically, combined with a big address book. You clicked on the address, the modem dialled, and on reply, the voice was routed via the aux telephone connector in the modem to a real phone (that the modem had disconnected while dialing), or via the computer soundcard if the modem had mic/out jacks, which is the case here. Again, I have not seen this in Linux, but it is plain old technology that predates Voice Over IP. Hey, no, there was a program in KDE 2 or 3 that did this. Years ago, yes. kaddressbook, perhaps? I don't remember.
You can do that, but with only 56K (actually, 56K down, 33.6 up) you'll have to use compression. The tightest compression is G.729A at 8 Kb/s, plus overhead. You may be able to get by with less compression and still fit within that modem's bandwidth.
You haven't understood the OP. This is plain voice, not Voice over IP.
I do not understand why I should use compression. The regular phone conversation is not compressed either. Once more, I don't talk about VOIP. The issue is how I can transfer voice from the computer to the phone line with the help of the modem.
Correct. Yes, you can. The issue is just finding the correct software in linux to do it. - -- Cheers / Saludos, Carlos E. R. (from 11.2 x86_64 "Emerald" GM (Elessar)) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org/ iEYEARECAAYFAkxYgdEACgkQU92UU+smfQVh3ACcCF0GVOEZK6yioaGVkFYb+Bra jnMAoJM9j25eY7uZZIoVTV35JiUAPChV =CjsX -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org