[Asterisk-Users] Virtual Modems

[Miguel Ruiz Velasco Sobrino]

I may be missing something, but...
why do you want to relay a modem over an VoIP network? isn't it no-sense to warp digital
data inside analog signals to be warped over digital data?.
Isn't it easier (and MUCH MORE efficent in terms of bandwidth) to transmit the digital
data directly from one end to other? maybe with the use of some security layer or
protocol, so you can get rid yourself of the great overhead that those implies?


> I think for now you are stuck with modem pass through. Our company does
> a lot of Fax over IP applications and T.38 is used exclusively for
> faxing.
> 
> There has been some work on modem relay but it is still in the white
> paper stage at this point. There is an ITU protocol V.150 designed for
> modem relay over IP but I have yet to see any devices out there that
> support it.
>
> Here's a good albeit dated article on the topic:
>
> http://www.commsdesign.com/design_corner/OEG20030312S0017
>
>
>
> -----Original Message-----
> From: Nathan Goodwin [mailto:ngoodwin at datatech-cs.com] 
> Sent: Tuesday, December 14, 2004 10:57 AM
> To: Asterisk-Users at lists.digium.com
> Subject: [Asterisk-Users] Virtual Modems
>
> After searching the archives, I came acrross a few people mentioning 
> this, but I never saw anything about what became of it.
>
> Has anyone tried to make a virtual modem that could be directly handled 
> by astrisk, I saw a while ago that someone was going to try and make one
>
> using the same DSP libaries that the WinModems use, but then nothing.
>
> Would do this even be possible, and if so, what kind of connection 
> speeds could one hope to achive, with the compression and such?
> 
> I don't need a 56k connect (though it would be nice), but be able todo 
> 28.8 would be fine. :)
> 
> Also, would using the new T.38 (I think it is), that was designed for 
> faxes help modem calls any?

=====
Miguel Ruiz Velasco

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