This is the one where you do an att xfer to BOX A but the call you need to replace is on BOX B, so you have to call BOX B with invite +replaces then xfer onto that new call.
ITs a nightmare cos its really complicated  and breaks all the time.  I don't even have a way to test it very often.  you need to have a proxy that places one call from the phone to BOX A and the next to BOX B.

Good old bug 3710 from asterisk days on mantis 



On Thu, Aug 22, 2013 at 4:00 PM, Michael Jerris <mike@jerris.com> wrote:
Its the nightmare transfer on elm street?  For what its worth… sip shouldn't allow transfers to be done like this… the phones should really just "do the right thing" spike lee style when someone hangs up mid attended transfer, but most don't for some reason.

Mike

On Aug 21, 2013, at 8:00 PM, Jose Suero <ms@mstn.com> wrote:

> I'm swimming in a freeswitch log looking for a problem when all of the
> sudden this comes up:
>
> 2013-08-21 19:51:08.002385 [DEBUG] sofia.c:6928 1 .. 2 .. Freddie's
> commin' for you...
>
> Didn't find the freeswitch problem, but now have a machete masked
> fellow on his way :-)
>
>
> Made me smile


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