[Asterisk-Users] asterisk and pstn

[Kevin Brennan]

> In simple terms ISDN is a digital interface to the PSTN as opposed to the
> analogue RJ11 phone connectors your used to at home (POTS - Plain Old
> Telephony System).  ISDN lines (Integrated Services Digital Network)
> typically comes in two configurations BRI (Basic Rate has 2B+D channels
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 and
supports
> a much wider set of functions and services than POTS. In Ireland Eircom
> market ISDN as 'hi-speed', you may be familiar with this (this is not
ADSL,
> your not always online). The main suppliers of this type of service would
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 in perspective).
>
> To conect your * box to PSTN with BRI/PRI interface you'll need one of
> digium's cards or an equivalent CAPI card.
> Br /Kev/
>
> ----- Original Message -----
> From: "Ashling O'Driscoll" <ashling.odriscoll at cit.ie>
> To: <asterisk-users at lists.digium.com>
> 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 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.
>
>
> -------------------Legal
Disclaimer---------------------------------------
>
> The above electronic mail transmission is confidential and intended only
for
> the person to whom it is addressed. Its contents may be protected by legal
> and/or professional privilege. Should it be received by you in error
please
> contact the sender at the above quoted email address. Any unauthorised
form
> of reproduction of this message is strictly prohibited. The Institute does
> not guarantee the security of any information electronically transmitted
and
> is not liable if the information contained in this communication is not a
> proper and complete record of the message as transmitted by the sender nor
> for any delay in its receipt.
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>