[Asterisk-Users] FXS with v.90 modem support?

[Dustin Wenz]

Thanks for the info! Fortunately, we have something closer to the  
latter configuration you described. The PSTN goes directly into an  
MX250 as a SIP gateway, and our Asterisk server connects to that. The  
MX has a few FXO ports, but we don't want to use them. It doesn't  
seem very clean to have an IP phone system but yet still needing to  
run analog lines throughout the building. Although, the Atlas 550  
card would be nice if our Asterisk box were a little closer to where  
the analog devices are (and if they have OS X/PPC drivers for it).

Has anyone ever used the Vega 50? That seems the most promising  
solution so far.

	- .Dustin

On Feb 6, 2006, at 6:21 PM, Steve Underwood wrote:

> Dustin Wenz wrote:
>
>> I have a couple of devices that need an analog modem to  
>> communicate  outside of our Asterisk system. Most FXS gateways  
>> don't seem to  support this... I have a stack of Sipura 2002's  
>> that are, AFAIK,  worthless for this purpose.
>>
>> I've heard that Digium's IAXy FXS will work with modems, but I  
>> can't  find any reference to that in their documentation. There is  
>> also the  VegaStream Vega 50 that claims to support v.90 on 8 FXS  
>> ports per  unit. Does anyone have experience with these devices,  
>> or can  recommend anything else?
>
> Then important things here are that you must only digitise once,  
> and that the path must be clean and free of timing slips. Things like
>
> modem <-> FXS <-> asterisk <-> FXO <-> PSTN
>
> will not work. The signal is digitised, returned to analogue, then  
> the PSTN will digitise it again. In general VoIP boxes of any kind  
> will not work, as they do not guarantee a clean path. What should  
> work is
>
> modem <-> FXS <-> asterisk <-> E1 or t1 <-> PSTN
>
> However, a lot of people have problems getting even this  
> configuration to give clean enough results for V.90 to work.
>
> Steve
>
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