[asterisk-users] GSM mobile trunks

[Gordon Henderson]

On Tue, 23 Jun 2009, Sasa Bobek wrote:

> 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 :)

They're designed for remote areas - they are wall mountable and have an 
external antenna socket and an (rj11) phone socket on the side... Plug in 
an analogue phone and off you go.

The ones I've used & have also have internal rechargable batteries - which 
take-over when the mains fails - I imagine they'd be cheaper without all 
that additional hardware though.

> 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.

Right - best stick with that then!

Gordon


>
> 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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>