[asterisk-users] Can Asterisk act like an ISP dialin server to data callls from Sipura 3000 or other ATA connected devices ?

[Don Fanning]

Horse hockey...

I currently have a *BANK* of PAP2's hooked up to a wide array of analog 
modems (a USR Total Connect MP/8, two USR Courier V.Everythings and a 
Digi LANASERVER).

After balancing the audio on the pap2's to not feedback audio and reduce 
chances of echo occurring, I've had no problem maintaining all lines 
running whether it's within the LAN or from West Coast USA to Europe 
(fidonet bbs's and x.25 networks) or between the West Coast USA and 
Australia via SIP point-to-point.  The max speed i've obtained is 
33.6kbits/s and that's the normal maximum for *non-ISP* configurations. 

The key things to setup for is:

1.) Steady latency.  Latency is the line killer because modems rely on 
timing.  Most of the time (95%) it's not an issue as my routes to the 
various VSP's I use have a constant strain/timing between myself and them.
2.) Disable Data Compression on the modem and save it in the NVRAM of 
the modem.  (AT&K0)  Digitized analog signal already has enough lost 
bits. *DO* however leave Error Correction on.  If both modems support 
it, it helps tremendously even through "lag" events.
3.) Test, test and retest... Listen to the connection.  If it doesn't 
work at faster speeds, use the AT&Nx where x is a number from 0 (auto) 
to 1 (300bps) to 2 (1200bps) etc... so you can figure out the maximum 
potential of your hardware and voip connections. 

So yes Virginia, you can do analog modems over VoIP without issue.  And 
pull a decent data rate.  All you would need then is to configure the 
modem and the machine it's connected to as a PPP server then configure 
the phone to call your modem via *.



Anselm Martin Hoffmeister wrote:
> Am Dienstag, den 27.11.2007, 18:00 +0100 schrieb Robert Rozman:
>   
>> Hi,
>>
>> I have an older phone with touch screen from Philips. It have it connected
>>  to Sipura 3000 FXS port and majority of features work ok.
>>
>> But phone also has touchscreen and web browser that I'd love to use for
>>  accessing my local web pages. But the phone only allows me to setup ISP
>>  phone number (username and password) and it wants to call it to get to 
>> Internet. Since it is
>> connected to Sipura3000, call can come to Asterisk and I'd love to somehow
>> "fool" that device and connect it to local web pages ?
>>
>> I guess I could somehow mimic ISP "internet calling" feature on local 
>> Asterisk server, but have no
>> clue even where to start searching ...
>>
>>  Any advice ?
>>     
>
> Hi Robert,
>
> I researched for something similar about a year ago, and came up with
> nothing really worth the work. If you can, try to get another ATA that
> has a real, old-fashioned serial modem plugged into it, and limit that
> modem to 9600. I think more than that will not work reliably, but you
> could of course try.
>
> The only working implementation of software emulating a modem in
> conjunction with asterisk I have seen is fax-related, and even there I
> read from several people that anything better than 9600 is hardly ever
> achieved. The code there is cranked into fax-use though, not modem use,
> which would require the PPP bytestream to be off-handed instead of fax
> parsing. Perhaps iaxmodem would do that.... No idea.
>
> I'd be interested in how you get that working, if you do indeed.
>
> BR
> Anselm
>
>
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