[Freeswitch-users] Freeswitch + open vox G400P

[Brian Foster]

Sorry, I misunderstood how that worked :-)

Brian Foster
Endigo Computer LLC

Sent from a mobile device.
On Jun 5, 2012 1:18 PM, "Giovanni Maruzzelli" <gmaruzz at gmail.com> wrote:

> On Tue, Jun 5, 2012 at 7:03 PM, Brian Foster <bdfoster at endigotech.com>wrote:
>
>> Maybe you've gotten used to the superior sound quality freeswitch
>> provides :-)
>>
>> Your audio quality is dependent on the equipment you are using, and the
>> E1550 is a good piece of equipment. Check your signal stregnth and make
>> sure you are giving the equipment the best chance of working. If that
>> device doesn't have an external Jack then USB port extenders work wonders.
>> Just remember that GSM isn't a high quality codec.
>>
>> If your phones take GSM (most IP phones do) then make sure GSM is being
>> used end to end (I.e. no transcoding). That might yield better sound
>> quality, and you should be doing this to decrease the load being placed on
>> your system.
>>
>
> No, there is no transcoding to/from GSM codec with mod_gsmopen.
>
> mod_gsmopen takes a digital stream in signed linear (SL16) at 16 bit, 8
> khz directly from the modem. It's the modem chipset that digitally converts
> from GSM codec to signed linear. So, mod_gsmopen passes to FreeSWITCH the
> SL16 stream 8khz, without touching it, in its purest form.
>
> But it's true that if you're used to use FreeSWITCH with 16khz (or
> superior) codecs, then you can be spoiled ;).
>
> -giovanni
>
> --
> Sincerely,
>
> Giovanni Maruzzelli
> Cell : +39-347-2665618
>
>
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