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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Google Multitech CallFinder GSM out of <st1:State
w:st="on"><st1:place w:st="on">Minnesota</st1:place></st1:State> if you want a
common off the shelf product. GSMA.org was using their product with FXO/FXS
for backup purposes.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I recall they have a GSM to FXO/FXS, and I
thought they had GSM to H323.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I also found a European company that made
high end (24+) GSM banks to FXO/FXS but can’t recall the name.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>George Bean<br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, December 06, 2008
8:56 AM<br>
<b><span style='font-weight:bold'>To:</span></b>
asterisk-users@lists.digium.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [asterisk-users] Sip Node
w/ 4 wire audio & AT command set callsupervision</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a href="http://www.sierrawireless.com/support/mp775.aspx">http://www.sierrawireless.com/support/mp775.aspx</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Has anyone seen any hardware, software or combination that
would allow me to accomplish such an interface?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>George<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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