firedude@shorelinuxsolutions.com
2003-Jun-21 05:39 UTC
[Asterisk-Users] PRI & BRI question
Greetings all, As most of you probably know from my previous questions on the list, I'm still in the newbie category. My question today is pretty brief, as I told you all a few weeks ago I ordered a PRI from Verizon. I understand that there is a "B" channel that comes with this. The question is just what can I use this "B" channel for and how??? Thanks AJ
A BRI has 2 B channels (voice or data at 64k) and 1 D channel (signalling at 16k), a PRI has 23 B channels and 1 D channel (64k in this case). From a telephony viewpoint that means a BRI has two voice channels and a PRI has 23. -----Original Message----- From: asterisk-users-admin@lists.digium.com [mailto:asterisk-users-admin@lists.digium.com]On Behalf Of firedude@shorelinuxsolutions.com Sent: Saturday, June 21, 2003 5:39 AM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] PRI & BRI question Greetings all, As most of you probably know from my previous questions on the list, I'm still in the newbie category. My question today is pretty brief, as I told you all a few weeks ago I ordered a PRI from Verizon. I understand that there is a "B" channel that comes with this. The question is just what can I use this "B" channel for and how??? Thanks AJ _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users
On Sat, 2003-06-21 at 07:39, firedude@shorelinuxsolutions.com wrote:> Greetings all, > As most of you probably know from my previous questions on the list, I'm > still in the newbie category. My question today is pretty brief, as I > told you all a few weeks ago I ordered a PRI from Verizon. I understand > that there is a "B" channel that comes with this. The question is just > what can I use this "B" channel for and how???PRI has 1 D channel and 23 B channels. The D channel is a data channel, bu this data channel is a point to point with your telco and is used to pass all the signalling data. The B channels are bearer and can bear voice or data. When a B channel is in data mode, it is basically a point to point 64K serial line. This is why there is a ZapRAS app in asterisk to turn a channel into a ISDN PPP link. -- Steven Critchfield <critch@basesys.com>