On Sun, 21 Aug 2005, Arik Funke wrote: > If this is a limitation of asterisk, where is it located? In the > chan_zap module? In zaphfc? I.e. would it help if I switched to mISDN?
It is inherent in the channel-based structure of Asterisk. An audio channel is the basic measure used by applications such as Dial etc. This is shared by all channels as far as I know. One can imagine a special version of chan_zap that decouples the Asterisk channel entities from the actual B-channels. It would always generate a new fictitious asterisk channel structure and only link it to a real B-channel once the signaling indicated that a B-channel was required. I would be interested in how the commercial SS7 implementation for Asterisk works. SS7 would normally allow the audio paths to change in mid-call to potentially follow an altogether different route. Peter > > Peter Svensson <[EMAIL PROTECTED]> wrote: > > On Sat, 20 Aug 2005, Nico Giefing wrote: > > >> how many connection do you have from your asterisk to the old pbx? > >> > >> i think on 1 ISDN connection its only possible to let 2 phones ring, > because > >> 1 ISDN 2 channels... > > > This is a limitation in Asterisk, not ISDN. Asterisk reserves a B-channel > for each destination at the time of the CONNECT message. In the isdn world > it is common to not actually allocate a B-channel until it is needed to > carry audio. This also prevents Asterisk from letting the upstream switch > select the B-channel on outgoing calls to the pstn. > > Asterisk is written this way since it uses the audio channel as the > fundamental unit, with the D-channel as carrier of signalling for the > individual B-channels. Another way to view ISDN is to consider the > D-channel the fundamental unit, which can carry several audio streams as a > side effect of the signalling. The first viewpoint resembles the > traditional view of telephony as individual circuits, the second resembles > the ISDN/SS7 view of the world. > > Changing Asterisk to be more ISDN-like is quite a lot of work. > > Peter > > > >> > >> ----- Original Message ----- > >> From: "Arik Funke" <[EMAIL PROTECTED]> > >> To: <[EMAIL PROTECTED]> > >> Sent: Saturday, August 20, 2005 7:44 PM > >> Subject: [Asterisk-Users] Ring more than two isdn phones simultaneously > >> > >> > > > >>> > I am using a HFC-S card in nt mode with zaphfc driver to connect an > >>> > internal isdn bus. I would like to signal an incoming call on, let's > >>> > say, 4 phones. Right now I use: > >>> > > >>> > Dial(Zap/g1/21&Zap/g1/22&Zap/g1/24&Zap/g1/23&Zap/g1/29,,t) > >>> > > >>> > where g1 are my two isdn channels provided by HFC-S card an the > >>> > 21,22,etc my internal numbers. > >>> > > >>> > When the command is executed however, only the first two specified > >>> > phones ring. Etc. with the first channel 21 ist called, with the > second > >>> > 22. How can I get asterisk to signal to all phones with just one isdn > >>> > channel? I am trying to duplicate the setup I had with my old > isdn pbx > >>> > with did above trick just fine... Maybe somebody can help me > configure > >>> > asterisk appropriately? > >>> > > >>> > Cheers, > >>> > Arik > >>> > > >>> > > >>> > PS: I gave following a try but without success: > >>> > Dial(Zap/g1/21-29,,t) > >>> > Dial(Zap/g1/21+29,,t) > >>> > _______________________________________________ > >>> > 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 > >> > > > Peter _______________________________________________ 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
