very very sure. pri's don't experience glare. channelized t1's do (they are actually CAS lines, or carrier associated signalling)
pri's use out of band signalling (the D channel,which is usually the 24th channel) Q.921 and Q.931 handle layer 2 and 3 call setup and tear down. Q.931 would not allow a simultaneous negotiation of both ends attempt to use a channel. See http://www.freesoft.org/CIE/Topics/126.htm for more info on Q.931 or, if you have a cisco box w/ a PRI on it, do a debug isdn q.931 to see the setup and tear down messages... W. Kevin Hunt CCIE #11841 www.huntbrothers.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Crick Sent: Tuesday, May 25, 2004 7:32 PM To: [EMAIL PROTECTED] Subject: RE: [Asterisk-Users] "Glare" condition - How well does asteriskhandle? > You are correct... No glare on a PRI Are you sure? What about the scenario where the CO switch offers you a call at the same time you try to set up an outbound call on the same channel? We dealt with this at my previous company (developing with VOS/CT-ADE and Dialogic hardware connected to PRIs) and I'm pretty sure there was some documentation from Intel that said how to deal with it. I think incoming calls have to take precendence, so if you try and make an outbound call at the same time an incoming call is presented, you answer the inbound call and give it regular incoming call treatment, then failover your outbound call to use a different channel. Ultimately, PRI is all about exchanging messages in the right order, so it's totally feasible that you could get glare, no? _______________________________________________ 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
