Re: [Asterisk-Users] GSM gateway for Asterisk

[OTR Comm]

I forwarded your note below to [EMAIL PROTECTED]  I found some docas
on the FCT-11M at their site, but it was in Chinese, so I sent them your
problem.

Hope they will respond to this list and maybe to you directly.

Murrah Boswel

- Original Message - 
From: Bill Michaelson [EMAIL PROTECTED]
To: asterisk-users@lists.digium.com
Sent: Monday, October 24, 2005 9:42 PM
Subject: [Asterisk-Users] GSM gateway for Asterisk


 I recently obtained a FCT-11M GSM-analog converter box.  It arrived with
 no documentation.  So I popped in a SIM chip, and connected the the RJ11
 port to an FXO port on my Asterisk box.  It worked smoothly right away
 for inbound and outbound calls in all respects.  For about an hour.
 Then either spontaneously or due to some action I've been unable to
 identify, call supervision and other functions became flaky.

 First, I noticed inbound calls started malfunctioning.  The Asterisk box
 answers, but no audio is heard on either end (the dialplan bridges to a
 SIP phone).  Also, the call never ends.  I can only knock it down by
 using CLI soft hangup or restarting Asterisk.

 Then outbound calls got wierd.  It will dial out thru the GSM network to
 my cellphone, and audio is OK in both directions, but call termination
 fails if initiated from the remote GSM side.  In that case, the box
 emits three short beeps, followed by a steady beep which is audible on
 the SIP phone to which the call is bridged.  The channels don't hangup
 until the SIP phone causes it to.

 I was initially concerned that I had fried the FXO port by using an
 incompatible device, but I've ascertained that the port still works OK
 with a POTS line.

 I now suspect that the FCT-11M has been reconfigured somehow, since I
 obtained it and it was working.  But I have no clue about how to examine
 it's configuration if possible at all.  It has a USB (master) port but I
 don't know what it is for.

 Does anyone know if English documentation is available, or otherwise
 have any ideas on how to debug this?  Much appreciate any insights.


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Re: [Asterisk-Users] GSM gateway for Asterisk

[trixter http://www.0xdecafbad.com]

On Thu, 2005-05-12 at 11:27 -0400, Kanuri, Seshu (Company IT) wrote:
 Folks!
 
 I am looking at a couple of models of Fixed GSM Gateways for the Purpose of 
 VOIP connectivity and specifically to work with Asterisk. I found that  these 
 can be imported into USA for about $99.99 or about that. This is a one 
 channel unit just like tellular, one of them has GPRS.


Something like this is similar to what I was asking about in a different
thread, however a SIP/GSM protocol converter would be more ideal.
Passively passing all data from the GSM network to the mobile and vice
versa, thus removing any requirement for a SIM in the GSM device that
gets installed.

Basically the mobile would register through this becuase the signal
strength is stronger, outbound calls would be routed to the PBX via SIP
(or other, SIP would make more sense as its more universal), inbound GSM
calls would be transparently bridged to the real mobile, all auth data
would be passed so the mobile would have the SIM and perform as if it
were directly connected to the GSM network.

A SIP IM to GSM SMS bridge would also be really ideal.

The ability for the SIP interface to cause a call to be initiated to the
GSM network would also be ideal (granted this would require the phone to
accept the auth data and reply accordingly, which could be a bit tricky,
but if the GSM mobile user attempted to place a call it should work,
although routing for that would have to exist on the GSM protocol
converter itself rather than via the PBX.

This would effectively turn any GSM phone into a pbx extension and/or
SIP phone, with the ability for calls to come into that phone from the
GSM network.

I strongly feel that SIP would be better than trying to tie in an Abis
interface into the PBX (those do exist commonly as a nanocell or
picocell transceiver).  

Because the protocol converter does not need to decrypt via A5 the GSM
calls, GSM MoU approval should not be required.  

In theory one could buy gsm transceiver boards and make their own device
using an embedded (or just nanoitx and non embedded) solution, slap on
some supported operating system and asterisk in the unit itself.
Granted it would not always need to be a full on asterisk implementation
since it does a very limited subset of features, but could be.  That
could incrase the SIP to all supported protocols.


-- 
Trixter http://www.0xdecafbad.com
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