> 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
Sorry that should read â3K/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" <[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 > _______________________________________________ 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