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

François fdelawarde at wirelessmundi.com
Fri Feb 20 20:37:49 MSK 2015


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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>>
>> -- 
>>
>> */Brian West/*
>> brian at freeswitch.org <mailto:brian at freeswitch.org>
>>
>>
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>
>
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