[asterisk-users] Sip Node w/ 4 wire audio & AT command set callsupervision

[Jason Aarons (US)]

Google Multitech CallFinder GSM out of Minnesota if you want a common
off the shelf product.  GSMA.org was using their product with FXO/FXS
for backup purposes.

 

I recall they have a GSM to FXO/FXS, and I thought they had GSM to H323.

 

I also found a European company that made high end (24+) GSM banks to
FXO/FXS but can't recall the name.

 

 

 

________________________________

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of George
Bean
Sent: Saturday, December 06, 2008 8:56 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Sip Node w/ 4 wire audio & AT command set
callsupervision

 

I have several discontinued Sierra Wireless MP775 mobile GSM/EDGE radio
modems. These devices were originally installed in emergency vehicles to
provide data and voice access along with GPS reporting. They have
external RF connections for GSM/EDGE and GPS signals. The baseband side
includes four wire audio, RS-232 serial, USB and some parallel digital
I/O for panic switches etc. GSM voice connections are established by
sending AT commands via the RS-232 serial or USB ports and utilizing a
handset connected to the four-wire audio jack. Here is a link to the
Sierra Wireless web pages for the MP775.

 

http://www.sierrawireless.com/support/mp775.aspx

 

My interest comes in finding an inexpensive way to connect an Asterisk
PBX or similar system to the PSTN via GSM when POTS and Internet service
isn't available or is too costly to connect. In my case, I'm considering
building a house at the end of a long unpopulated stretch of dead end
road and the cost of trenching and cabling from the nearest telco POP is
prohibitive.

 

I would like to find a way to connect these modems to my network so they
appear as a SIP FXS device. This would require a device
generating/reading AT commands and passing baseband audio on the front
end and SIP emulation on the backend. I'm sure there must be a way to do
this with a pc but to minimize power consumption; I would prefer to use
something like a small single board computer with a Geode processor. The
latter, having multiple RS-232 and audio ports, ought to be capable of
handling at least two of the MP775's.

 

Has anyone seen any hardware, software or combination that would allow
me to accomplish such an interface?

 

Regards,

George

 

 




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