[asterisk-users] GSM mobile trunks

[Michael Graves]

Have you seen the new GSM module for the TDM-400 card? It fits right in
where you would normally have an FXO or FXS daughter card. Not sure
about the price but it stands to be cheaper than any external device.
Also allows for considerable density. Not sure about availability.

http://www.mgraves.org/voip/2009/04/new-tdm-gsm-module-for-asterisk/

http://www.asteriskgsmmodule.com/index.html

Michael

--Original Message Text---
From: Sasa Bobek
Date: Tue, 23 Jun 2009 13:57:22 +0200

Thanks for the info Gordon.  Just what I was looking for.  I think I
have seen one of the telecom FM units, it actually has a whole phone
inside :)
In my end of the world things are quite different :)  Portech costs an
average of 160E per port, and the cost of the GSM adapter including the
cost of the FXS/FXO port is about 50E.


Sasa

On Tue, Jun 23, 2009 at 1:17 PM, Gordon Henderson
<gordon+asterisk at drogon.net> wrote:
On Tue, 23 Jun 2009, Sasa Bobek wrote:


The price difference is HUGE. Analog i about 66% cheaper.



But you then need some sort of analogue adapter/interface to feed the
analogue GSM module...

Although if you've already got this, it's a obviously a cheaper option.

However, here in the UK, the price difference isn't that bad, but it
might be that the number of ports you'rea fter makes a difference -
e.g. a 2-port SIP Portech units is £321, a single (analogue) port
Telecom FM unit is £119. (so actually slightly cheaper for 2 ports with
SIP Ethernet Interfaces here), but if you're looking at a dozen
channels it might well be different..

However - to your original question - I've used both the Portech and
Telecom FM units (on a TDM 400 card) and not really been able to tell
the difference. The Portech dials quicker, the Telecom FM obviously
needs to get the number passed via DTMF, but since GSM is ... GSM which
is pretty poor speech quality to start with, it didn't make any
difference I could tell.

Gordon



 
On Tue, Jun 23, 2009 at 12:44 PM, Gordon Henderson <

gordon+asterisk at drogon.net <gordon%2Basterisk at drogon.net>> wrote:

On Tue, 23 Jun 2009, Sasa Bobek wrote:

Hi all,
We have been planing for a long time to set up GSM mobile trunks for
termination, and were planing on going with analog GSM adapters
connected

to
a VoIP gateway.  Should we be concerned with such a set-up as far as

voice
quality and other issues are concerned?  Any experiences with GSM

terminal
chipsets?


Why not SIP based GSM devices? e.g. Portech?

Gordon

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--
Michael Graves
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http://blog.mgraves.org
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