[Freeswitch-users] Data modem (V32, V92) with SpanDSP

Sat Feb 21 16:27:35 MSK 2015

I wonder what you mean by using V.32 over a GSM modem? A GSM voice 
channel cannot handle V.32. In the past many GSM networks had a modem 
adaptor at the interface between the telephone network and the GSM 
network, but I don't think many of those are still in place.

Regards,
Steve

On 02/21/2015 01:37 AM, François wrote:
> I don't know about v.150, but lots of devices (telecare and other 
> sh..ty IoT stuff) use V32 over crappy GSM modems. Right now can't talk 
> to those without a "real" modem.
>
> Yeah, I know in 2015 they should be using IP over modern data 
> connections (or even GPRS), but you know how it is...
>
> AFAIK, SpanDSP seems to be missing those "data modem" stuff (V32 at 
> 9600 and V92 at 56k)...
>
> François.
>
>
> On 02/20/2015 05:13 PM, Michael Jerris wrote:
>> One of the reasons that has kept any work ever happening on this is 
>> we can't seem to find a single device that actually claims to support 
>> v.150.  Spandsp already has quite a bit of the modem code for 9600 
>> and 14400 but its not exposed to a data modem interface.
>>
>>
>>> On Feb 20, 2015, at 11:08 AM, Brian West <brian at freeswitch.org 
>>> <mailto:brian at freeswitch.org>> wrote:
>>>
>>> You want v.150.1, GOOD LUCK!
>>>
>>> On Fri, Feb 20, 2015 at 9:13 AM, François 
>>> <fdelawarde at wirelessmundi.com <mailto:fdelawarde at wirelessmundi.com>> 
>>> wrote:
>>>
>>>     Interesting.. Looks like some type of T38 for data-modem over
>>>     VoIP. Unfortunately FS/SpanDSP don't support this AFAIK.
>>>
>>>     Also I was thinking of using a PRI line (freetdm) to avoid VoIP
>>>     issues.
>>>
>>>     Thanks,
>>>     François.
>>>
>>>
>>>     On 02/20/2015 03:53 PM, Sergey Safarov wrote:
>>>>     I not know FS support this scenario but this may be help you
>>>>
>>>>     http://www.voip-info.org/wiki/view/Modem+over+VOIP
>>>>     http://www.cisco.com/c/en/us/td/docs/ios/12_4t/12_4t4/mer_cg_15_1_4M.html
>>>>     https://support.sonus.net/display/VXDOC/V.150.1+Device+Support
>>>>
>>>>     On Fri, Feb 20, 2015 at 5:36 PM, François
>>>>     <fdelawarde at wirelessmundi.com
>>>>     <mailto:fdelawarde at wirelessmundi.com>> wrote:
>>>>
>>>>         Self answer: Apparently SpanDSP does not support V32 nor
>>>>         V90/V92.
>>>>
>>>>         Also I can't seem to find any other solution. The objective
>>>>         was to fetch
>>>>         data from remote GSM sensors using simple protocols over
>>>>         V32 and similar...
>>>>
>>>>         François.
>>>>
>>>>
>>>>         On 02/20/2015 11:07 AM, François wrote:
>>>>         > Hi all,
>>>>         >
>>>>         > As seen in the HylaFax wiki entry, mod_spandsp can be
>>>>         used as a soft-modem.
>>>>         > https://wiki.freeswitch.org/wiki/HylaFax
>>>>         >
>>>>         > Can it also be used as a data modem (not just fax modem)
>>>>         with V32, V92
>>>>         > or similar protocols?
>>>>         >
>>>>         > If not, does anyone know of any data-modem software that
>>>>         could work
>>>>         > along with FreeSWITCH?
>>>>         >
>>>>         > Thanks,
>>>>         > François.
>>>>         >
>>>>         >
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>
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