Ashling O'Driscoll wrote:
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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Hi,
I'm pretty new to asterisk myself and we haven't gotten the system running yet, but this is what I found out so far about ISDN and PRI (I'm really new to phone technics, so I hope I'm not telling rubbish here):
- There are ISDN Cards that support BRI-interfaces (Basic Rate ISDN) (2 simultanous calls per line) with up to 4 lines. e.g. AVM C4
- From Digium and other manufactures you can find 1-4 line PRI (Primary Rate ISDN) cards (each line supporting 24/30 simultanous calls, depending whether you are in europe or america) e.g. TE405P
I think the prices for those two types are about the same (execpt that the telecom provider will charge a lot mor for the PRI-Connection).
Have a look at Wikipedia for some basic information.
philipp
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