2008/9/29 Olivier <[EMAIL PROTECTED]>: > Hi, > > Reading http://www.asteriskguru.com/tutorials/bri.html , it seems PtP is > the way to connect businesses but if you read > http://public.swbell.net/ISDN/connect.html you would think the opposite. > > Can anyone elaborate a bit PtP or PtmP respective advantages ? >
IMHO: PtMP should only be used if you have Multiple devices connected to your ISDN (Hence the Multiple part in its name) - This setup means that for each outgoing call, the calling device has to negotiate almost from scratch, access to a B-channel, and every inbound call is sent (broadcast) to every connected device to give it the chance to grab it. This is an almost compeletly chaotic and stateless environment (I know, of course there IS state, just a lot less of it). PtP on the other hand is stateful - The one device negotiates a connection when it comes up, and monitors the line constantly, so it knows if (for example) the line goes down. Calls in both directions are sent to the one known endpoint, directly addressed to a B-channel that it already knows should be available. Also, if a call comes in to an unrecognised DDI/address, PtMP can only time-out (no-one grabs the call) where PtP can dynamically know that the call is rejected and handle it "properly" For 99% of Asterisk installs, where Asterisk is managing/routing all calls on a line, PtP is going to be the right choice. Cheers, Steve _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
