[asterisk-users] GSM mobile trunks

[Gordon Henderson]

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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