You would have another option if you have fibre from one of the other carriers (Esat, NTL, etc) - you are in a college so you might have? - they can give you E1 lines over their equipment rather than copper coming from the outside.
Derek
Ashling O'Driscoll wrote:
Thank you very much for the reply. That has made things a good bit clearer. Am I correct in my current understanding:
So basically if I want to support approx 100 calls, I would have to purchase a digium PRI card and then pay eircom (or whoever my service provider is) approx 3000 a year for the PRI ISDN connection??
My other option is to have a BRI connection which could support approx 8 calls ("calls perline, 4 line card) and pay my service provider alot less for a bri connection.
I could also use an fxo card in * connected to my hpine line but that would only support one call at a time.
Are these the only main implementation options? Has anyone come across the Skype Voip gateway (VTA1000) or where does that fit in the scheme of things?.....are there new options emerging??
Sorry if these questions seem a bit dense but I am doing this as part of a research project and since I am a student who has has no experience working in industry I am clueless when it comes to how such a service would be implemented in practice and the cost of it. I am appreciative of any knowledge passed on from others who have practical know how.
Thanks again, Aisling.
---- Original Message ---- From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Asterisk-Users] asterisk and pstn Date: Wed, 24 Nov 2004 21:11:02 -0000
In simple terms ISDN is a digital interface to the PSTN as opposedto the
analogue RJ11 phone connectors your used to at home (POTS - PlainOld
Telephony System). ISDN lines (Integrated Services DigitalNetwork)
typically comes in two configurations BRI (Basic Rate has 2B+Dchannels
ie.
2 speech 1 data ) and PRI (Primary Rate , (Europe)30B+D - 30 speech+ 1
data). Because ISDN is digital the interface it's more advanced andsupports
a much wider set of functions and services than POTS. In IrelandEircom
market ISDN as 'hi-speed', you may be familiar with this (this isnot
ADSL,
your not always online). The main suppliers of this type of servicewould
be
Eircom, Esat and COLT. Line rental for PRI will be in the order of
€3K/month
Sorry that should read €3K/annum
plus a setup fee (yes - that puts the cost of the card inperspective).
To conect your * box to PSTN with BRI/PRI interface you'll need oneof
asteriskdigium's cards or an equivalent CAPI card. Br /Kev/
----- Original Message ----- From: "Ashling O'Driscoll" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, November 24, 2004 4:17 PM Subject: [Asterisk-Users] asterisk and pstn
Hi,
First of all apologies because this isn't strictly a purely
whole.question.
I am quite new to asterisk and actually to voip/telephony as a
I currently have sip calls working through asterisk. The asteriskcalls
server is behind a linksys router. I would now like to connect
callto 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
at a time. To connect analog phones from the inside network(i.e.the
portsasterisk 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
mybut 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
Disclaimer---------------------------------------currently very hazy understanding of voip telephony with asterisk
Thanks again, Aisling.
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