[Asterisk-Users] Ring more than two isdn phones simultaneously

[Arik Funke]

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?

Best regards,
Arik


Peter Svensson <psvasterisk at psv.nu> 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" <arik.funke at gmx.de>
 >> To: <asterisk-users at lists.digium.com>
 >> 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
 >>> > Asterisk-Users at lists.digium.com
 >>> > http://lists.digium.com/mailman/listinfo/asterisk-users
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 >>> >    http://lists.digium.com/mailman/listinfo/asterisk-users
 >>> >
 >
 >>
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 >>


Peter
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