[asterisk-users] GSM mobile trunks

[Sasa Bobek]

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 <gordon%2Basterisk 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> <
>> gordon%2Basterisk at drogon.net <gordon%252Basterisk 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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