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 â3K/month 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" <[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 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 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
