[Asterisk-Users] asterisk and pstn

[Ashling O'Driscoll]

Hi,

First of all apologies because this isn't strictly a purely asterisk
question.

I am quite new to asterisk and actually to voip/telephony as a whole.
I currently have sip calls working through asterisk. The asterisk
server is behind a linksys router. I would now like to connect calls
to the pstn. I have researched into several ways to do this but
because I am not very knowledgeable about telephony I am now quite
confused. This is what i understand so far. If this is incorrect or
if anybody has any ideas as to I could implememnt this in a
better/more scalable fashion, I would really appreciate it.

I could put a fxo card in my asterisk server and connect this to a
telephone line. This would enable sip to pstn calls but only one call
at a time. To connect analog phones from the inside network(i.e. the
asterisk network) going out I would need an fxs card.

Now the problem with the above scenario is that only one call would
be allowed at a time. I know I could get an fxo card with a few ports
but that would still only allow a few calls. To implement a network
where several calls are possible then do I need a pbx with a PRI
interface?? Also where does all the digium cards come in all
this??Where do they fit in??

I would be extremely grateful if somebody could shed some light on my
currently very hazy understanding of voip telephony with asterisk

Thanks again,
Aisling.


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