Can I use Celliax for 4 different GSM handsets?
Sat, 2007-06-02 01:16 — hakem
Hello,
I am new to Celliax and firstly, congratulations for this "grandiose" project.
Here is my question:
Assume I want to create 4 channels to connect to 04 different GSM handsets (mor gsm modems).
Do I need to plug in computer 4 différent sound cards?
Can this be handled by Celliax?
What hardware is suggseted in this case?
Thanks,
Hakem,
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Yes, you need 4 sound
Yes, you need 4 sound cards.
Or one card with 4 input and 4 output.
Or (in Linux) you can made yourself the audiocables and use just two soundcards, using the right and left channels of each LineIn/LineOut (***not*** the MicIn, it is mono!), and write an .asoundrc for ALSA that use each channel as a separate "virtual" soundcard.
Yes, this is just what celliax is made for ;-)
I will try with the cheapest hardware you can find, like two second hand soundcards, just to begin...
Feel free to ask for more (or more specific) infos...
Giovanni
Lots of sound cards :)
The solution is simple: buy USB sound cards... :)
- Linux detects it very easily
- USB sound cards doesn't need expensive PCI slots, only a free USB slot (probably doesn't work in USB bus-powered hubs, because this cards feeds some power)
- They're VERY VERY cheap (here in Venezuela I found one for only Bs.40, approx. US$15)
- Probably this sound cards doesn't have excellent sound quality, but... who cares? it doesn't matter ;)
- and works perfectly in celliax...
I have, now, 2 cellphones in celliax with this configuration. But the previous version (not the SNV version) had some issues with ALSA, and didn't worked no more than ONE. But the guys at celliax did an excellent work changing the sound library, and now, works perfectly with two. I can transfer the call from one cellphone to another without problems
I want to know why celliax need sound card for each medem
We made a program that transfers Voice in the two ways without using Voice card but using Motorola serial port's cable then we used asterisk to interface the VOIP side to create VOIP to GSM gateway on a kit. We intend to make thousands of GSM calls in the same time, then we heard about celliax but you use a sound card for each GSM module (Motorola mobile) that is a fetal problem for us !!!
can anyone help me by an advice quickly, thanks.
Interesting...
The real reason celliax needs a sound card for each cellphone is simple: you need two channels, one for control (hangup, place a call, etc), and another for the audio stream. As far as I know, a plain cellphone (not the GSM modules) doesn't have this mode for send and receive audio (if it exists, wil be cool!), but (I repeat) as far as I know, only the GSM modules (for example, the Motorola G24) can do that. In fact, if you read the G24 manual, it says how to stream a full-duplex audio via serial. But I tested the audio commands in Motorola common cellphones some months ago, and doesn't work at all.
I dunno if you can place a thousands GSM calls using one module :), but it's for sure if you're using a 115200 bps speed, you cannot place more than two (perhaps three) calls because this modems (AFAIK) uses ADPCM @ 11kbps.
Celliax without soundcards...
Thanks Nestor for this post. I agree completely with you.
Anyway, there are lots of not documented commands in motorolas, and also there are motorola models that can be seen as usb audio devices (but don't work. Probably you need some special command to make them work).
So, if anyone has any kind of info, please let us know :-)
Giovanni
Oh yes? I didn't know
Oh yes? I didn't know that!!!
Please, tell us (if you know) what models do you know that do audio USB... I'll test it :)