On Mon, 2011-05-30 at 13:57 +0530, virendra bhati wrote: > Thanks a lot all, > Now my view is clear ... > > On Sun, May 29, 2011 at 3:15 PM, Gordon Henderson <gordon > +aster...@drogon.net> wrote: > On Sun, 29 May 2011, virendra bhati wrote: > > Hi List, > > I have stupid question but I want to know it. Why we > use the PRI insted of > BRI ? Just for the sake of number of lines or any > thing else ? > > > It probably depends on your country. > > In mainland europe (or maybe just Germany), ISDN2e (BRI) is > very popular - not uncommon in home installations too. > > In the UK, it's almost the standard in small businesses - the > migration path seems to be from a single line to 3 lines > sharing the same number to ISDN2e... > > There was a push in the UK to support BRI in the home (~10 > years back, under the name Home Highway), but it came at a > time when ADSL was almost upon us, and BT in their infinite > wisdom removed a lot of the ISDN features that make it > actually useful... > > I don't think BRI ever caught on in the US - It was analogue > or PRI (or channelised/fractional T1 or whatever it's called) > Probably made it much easier for the telcos to support (and > afford)
Only reason for using bri instead of pri in the number of voice chanels and costs. It took ages before telco's realised that with fractured-E1 they could save a lot of costs (telco/customers) while offering a cheap upgrade path. At that time that ISDN was introduced, the costs in installing a pri-interface in the local-exchange was identical to installing a bri-interface. Only reason nowadays for using bri instead of pots, is that you get the incoming speech channel already digitialised. > And why SIP is used for making calls rather then IAX? > Even we know IAX takes > 1 channel for making calls? > > > SIP is an open standard that's been around since the late > 90's. IAX, which is also open and free was only just accepted > as a standard last year, but even so, there's inertia. Very > few phone manufacturers are using it - why should they, when > they've been using SIP for years, and the same PBX that works > with IAX also works with SIP... (And does any other PBX > support IAX yet?) > Freepbx is the only other afaicr. Only a limited number of clients. hw -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users