[Asterisk-Users] How to get call back when transfer fails

[Andrew Kohlsmith]

> Well you could do a supervised transfer, or 3 way call. Basically, you
> place the one leg of the call on hold, dial the extension you are to
> transfer to, then if you successfully connect, bring the call to three
> way, and then excuse yourself.

Ok, I understand that one.  Overkill but it would work.  I know how to do this 
on a Zap interface (hookflashes) , but how does one do it on a SIP or IAX 
interface?

> Or you could create a kind of Macro for transfers where it stores the
> originating part of the transfer, and upon failed connect, does a return
> dial. This would bypass normal call routing where a direct call would go
> to voicemail if it misses a person at the end.

I thought of that too, but I don't think it'll work:

exten 101,1,Setvar(myexten)
exten 101,2,Dial(Zap/1,10,t)
exten 101,103,getvar(myexten)
exten 101,104,Dial(myexten)

If extension 101 is busy it will immediately try to dial me, but I'm still on 
the phone since the transfer didn't complete...

Or did I misunderstand "return-dial" ?

-A.