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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