[asterisk-users] 3-way calling for IAX channels

[Tilghman Lesher]

On Wednesday 23 July 2008 12:17:26 Steve Davies wrote:
> 2008/7/23 MFH <asterisk-admin at hulber.com>:
> > Noah Miller wrote:
> >> Hi Daniel -
> >>
> >>> How can I made a 3-way conference betwwen IAX channels?
> >>> My current version is: 1.4.21.1
> >>
> >> Anytime you need a call with more than 2 parties, you need to use some
> >> kind of conferencing application.  The "default" conference
> >> application for asterisk is meetme. You can use meetme with any kind
> >> of channels (IAX, SIP, MGCP, ZAP/Dahdi, etc).  Just use the meetme()
> >> application in extensions.conf, and create your conference rooms in
> >> meetme.conf
> >
> > Asterisk supports conferencing without using meetme.  In this case you
> > don't have a central dial in number but a single extension can initiate
> > the conference call.  Generally this is done the same way as with
> > traditional PSTN service which is that while on a call between two
> > parties, flash the line, dial out to the third party then flash again
> > and all the parties should be connected.
>
> I believe that response is slightly misleading - "Asterisk" does not
> support conferencing without using meetme, but Zaptel/DAHDI will
> emulate the PSTN flash/recall facility which looks a bit like a
> conference. In SIP, IAX, and I believe all other non Zaptel/DAHDI
> channel types, the endpoint must manage the equivalent of a PSTN
> flash/recall conference.
>
> Anything cross-channel or otherwise more complex does indeed require
> app_meetme. Given that the OP was referring to IAX, I believe they
> will need app_meetme.

The interesting thing is that Zaptel/DAHDI is using exactly the same
conferencing/audio mixing engine as app_meetme.  Or more correctly,
app_meetme is using the Zaptel/DAHDI engine for audio mixing.

-- 
Tilghman