[asterisk-users] Multiple simultaneous calls

[Steve Totaro]

Stefano Totaro,

Off topic.  I just noticed your name and was a little surprised!? ;-)   
Are you in Italy / Sicily?

Anyways, you can achieve overhead paging through a sound card hooked to 
an Amp and speakers from your PBX.  I have yet to do it but have read 
about it.  I think this may be the better solution for you unless you 
are set on doing it over IP.

Check here for several options 
http://www.voip-info.org/wiki/view/Asterisk+Paging+and+Intercom

I am pretty sure if you use a ring group or meetme, there is no way 
around each phone having it's own stream. 

Interestingly, 3Com systems do conferencing and paging through multicast 
which is a nice idea but in practice can be a real pain to configure 
network components to work properly (especially if you do not control 
the network or you are trying to implement paging between remote 
offices).  I have spent hours on this exact problem in the past.

If it were me, I would probably not want all that traffic on the PBX 
unless that is all that it will be doing or if you go the sound card 
route.  I would use ices2 and let everyone stream from a different 
server than the PBX. 

Since you are using phones, I do not know that ices2 would work for you, 
something must initiate the call.  I would probably have a second 
Asterisk box to just handle the paging, setup an extension the dialplan 
of the main PBX to dial the paging machine via SIP (and possibly include 
Authenticate) that would drop the call into something like this:  
http://www.voip-info.org/wiki/index.php?page=Asterisk+cmd+page

Thanks,
Steve Totaro



stefano.totaro at transport.alstom.com wrote:
>
> Hello Steve,
> thanks for your anwer.
> Yes, you are right we want to do VoIP telephone system capable also of 
> "public address" (overhead paging) service.
> So synchronization is a key issue if we want to avoid unpleasant effects.
> We are designing our phones and they will have also onboard amplifiers.
> What I am trying to understand is whether we may use the phone system 
> also for this service or if it is better
> to go for a specific streaming technology (Ices2 is a good suggestion 
> thanks).
>
> What happen if I put all the phones in a ring? Do they join the same 
> multicast stream or a single stream for
> each phone will be created?
>
> Thanks again.
> Stefano
>
>
> Inactive hide details for Steve Totaro <stevetotaro at hotmail.com>Steve 
> Totaro <stevetotaro at hotmail.com>
>
>
>
> 	
>
>                         *Steve Totaro <stevetotaro at hotmail.com>*
>                         Inviato da:
>                         asterisk-users-bounces at lists.digium.com
>
>
>                         Phone:
>                         01/03/2007 18.33
>                         Per favore, rispondere a Asterisk Users
>                         Mailing List - Non-Commercial Discussion
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> 	
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> Per: Asterisk Users Mailing List - Non-Commercial Discussion 
> <asterisk-users at lists.digium.com>
> Cc: (ccr: Stefano TOTARO/ITVRN01/Transport/ALSTOM)
> Oggetto: Re: [asterisk-users] Multiple simultaneous calls
>
>
>
> stefano.totaro at transport.alstom.com wrote:
> >
> > Hi Guys,
> > I am a novice of Asterisk and I need some experts help to understand
> > what I can get out of it.
> > I need to make multiple calls (let say 50) at once to autoanswering
> > softphones on a LAN and send all of them the same message that they
> > will repeat with loudspeakers in the same environment.
> > I am a little concerned about synchronization of the phones and
> > moreover it is not much clear to me if I have to open 50 connections
> > and send 50 times the same packets or if can use in some way the
> > multicast.
> > Is there anybody that may give me some idea.
> > Thanks in advance,
> > Stefano
> >
> I suppose you could do that although, I am unclear on the auto-answering
> softphone and the loudspeaker thing. Is this just for overhead paging
> or something?
>
> You could put all the phones in a ring group with ringall and use the
> computer's sound card to connect to an amplified speaker setup.
>
> You could also look at ices2 to stream audio or some other streaming
> technology.
>
> Thanks,
> Steve
>
>
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