Question

Building linux based cell phone...

Asked by: chuckycharms

Ok All,

By day I am a network administrator in a primarily windows enviroment, so my linux is rusty.

Anyhow, I have a project where I would like to make a call to a device on a cell network, have an IVR (Interactive Voice Response) prompt to press a key, and depending on the key pressed throw a relay (just need a second or two of a couple volts).

My project is just begun. Where I am currently having issues finding good information is the ability to have gsm or cdma modules to interface with a PC. The module can be mini-pci or usb, or anything else that I can port to those to interfaces.

I am looking at a gumstix pc board to run the software. There are some open source projects out there that are simalar but they all seemed to have died a couple of years ago.

Any thoughts on this would be great.

Thanks,
Adam

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Asked On
2009-10-26 at 21:17:07ID24846087
Topics

Embedded Hardware

,

Asterisk Open Source Telephony

,

Telecommunications

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: Frosty555Posted on 2009-10-26 at 22:56:36ID: 25669427

It sounds to me like some kind of asterisk solution is what you want, but Asterisk primary supports using a full size computers, with the incoming trunk being either an SIP/IAX line coming in over the internet via a VOIP service provider (such as: http://www.netvoice.ca), or by using a regular landline which is being read and digitized using an FXO card. Support for cellular phones I have no idea what Asterisk has in the way of that.

If you are planning on using Asterisk, I've had the best luck with AsteriskNow. It's a nice self-installing bootable ISO designed to wipe out your computer and turn it into an asterisk box. As of 1.5.0 it supports the FreePBX front-end interface which is pretty easy to use and configure: https://www.asterisk.org/downloads

 

by: Frosty555Posted on 2009-10-26 at 23:06:03ID: 25669440

Your other option, which to me is sounding a lot more attractive, is to get your hands on a GSM modem. Basically it is a device which bridges GSM communication to a serial port. The main use for these things to to be able to have a computer receive a text message. GSM modems will typically have their own programming API / libraries / drivers, or at least a specification for how the incoming serial data is to be interpreted. The serial interface would make it ideal for interfacing with something like a gumstix, or maybe a beagleboard. CDMA modems exist too, which are basically the same thing except using the CDMA protocol

Some reading material:

http://www.developershome.com/sms/GSMModemIntro.asp
http://www.smssolutions.net/hardware/cdma1/


Back on the making-this-work-through-asterisk topic, you might be interested in a GSM->Voip gateway. These convert GSM into a format that Asterisk can understand. More info:

http://www.voip-info.org/wiki/view/VOIP+GSM+Gateways

 

by: chuckycharmsPosted on 2009-10-27 at 17:48:30ID: 25679128

Thanks for the input. I should have said, I plan on running asterisk, I have found a flavor that runs on the gumstix even. My only issues that I can forsee is getting a gsm to interface with asterisk. Is the only semi-straight forward way with a sip/gsm gateway? I would like to keep this as compact as possible.

 

by: Frosty555Posted on 2009-10-27 at 22:53:29ID: 25680234


I think a GSM gateway is the only way to go if you want asterisk to be your back-end. Asterisk only supports SIP and IAX trunks coming in via the network. You need to convert from GSM to that. Since SIP is an ip phone standard, and IAX is proprietary to asterisk, the hardware you find will most likely be GSM->SIP gateways. Perhaps you can find a lightweight / small one?

 

by: chuckycharmsPosted on 2009-10-28 at 08:44:53ID: 25684537

That answers my question regarding gsm, thanks alot Frosty.

Now any thoughts of the best way to through a relay from the gumstix? I planned on writing a linux script that is triggered by asterisk.

Thanks Again!

 

by: chuckycharmsPosted on 2009-11-07 at 18:46:34ID: 31646281

Question just died without a fully answering all of the questions involved.

20120131-EE-VQP-002

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