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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