Use a GSM to SIP gateway to cut your airtime and issue cells with M2M enabled. I did this:
 
http://lists.digium.com/pipermail/asterisk-users/2005-December/138400.html
 
hth
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 11, 2006 1:53 PM
To: [email protected]
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: [asterisk-biz] Need a solution for wifi connection with Asterisk

Hi,
 
One of my customers, that currently have Asterisk installed for more than 300 extensios and is very happy with the solution, needs to add some mobile extensions.
 
That extension (20 aprox) need to be used on the terminal station (they are a transport company), and around a superfice of 2,000 m2.   Initially, we thought about adquiring wifi phones and wifi spots on all the complex, but we are afraid of trunking.. I meant... what happens if a user is not further reachable by a hotsport and need to trunk to another one ? Is this done automatically ?  A lost of 3-4 seconds on data transmition on wifi is not critical (to allow trunk to be done) but it is a mojor concern on voIP, since it would hang your communication.. also, not sure if the trunk (movement from one wifi hotspot to another) will be done automatically or not.
 
I do not known what solution to give, since DECT mobiles conected using an ATA to asterisk will not have enough range to satisfy the customer......
 
Could any one advise on what solution to follow ?
 
Thks
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