[Asterisk-Users] Extensions to solve three way calling problem

[Steven Critchfield]

On Wed, 2005-01-05 at 18:38 +1100, PHP Mechanic wrote:
> >> Have you considered setting up a meetme confrence line for them? :)
> >
> >> > analog phone <=> asterisk/tdm11b <=> pstn
> >
> > The meetme option is nice, but it doesn't solve the problem. The TDM11B 
> > only
> > has one FXO, one FXS. To get the effect the daughter wants requires
> > supporting the threeway facility the telco offers. You need to Flash the
> > outside line. Zap does have an application for that, but I haven't played
> > with what it can do, or how to program it.
> 
> I have played with it. But the problem I'm having is as follows
> 
> exten => _1800.,1,Dial(Zap/4/${EXTEN},20,Tr)         ; call some company 
> willing to pay for my test, preferably get someone with an on hold message
> ; Now I press #* on the analog phone to transfer them to Meetme
> exten => *,1,Meetme,2000                                           ; send 
> them to meetme
> exten => *,2,Flash()                                                      ; 
> flash the pstn line

What makes you think that would flash the PSTN line? This is your
problem. When you transfer the PSTN line anywhere and then go to dial
again, the flash is actually on the current channel. I wouldn't be
surprised if you hear it in your receiver. I don't know of anyway to
flash the PSTN line from within asterisk that would do as you want. In
fact, to enable it would be a security risk as well. Think of the
possibility of having multiple lines in and then dialing an extension to
flash the line and messing up and flashing someone else's connection. 

Closest thing I could think of is having your PSTN side caller do the
transfer and redial. If the PSTN caller was allowed to transfer the
inside person and then dial a special extension that would initiate the
flash and the dial command. Of course the trouble here is that as soon
as the flash occurs, the new caller is the one going to be stuck in an
odd state and the previous PSTN caller is going to be in unrecoverable
limbo.

Just looks like you will be SOL on utilizing the PSTN 3 way calling.  

-- 
Steven Critchfield <critch at basesys.com>