[Asterisk-Users] IAX blind transfers

[Paul Seymour]

On Thu, 14 Apr 2005, Paul Seymour wrote:
> 
> > Just a quick question to ask if blind transfers (via #) are
possible?  I
> > have an IAX2 connection to my VOIP provider. In my dial plan I
sometimes
> > forward an incoming call back out on IAX, but when this happens I
seem
> > to lose the ability to transfer the call.  If the incoming call uses
> > SIP, or the destination uses SIP, transfer works.  I've noticed that
in
> > the Asterisk CLI I get message saying "Attempting Native Bridge",
but
> > nothing more to indicate whether this failed or succeeded.  I have
tried
> > notransfers=yes and notransfers=no in my iax.conf, but this doesn't
seem
> > to make a difference, as best I can tell asterisk is staying in the
call
> > though, so I'm guessing blind transfers aren't possible?
> 
> If the Asterisk box IS doing IAX native bridging, then the # won't be
seen
> on that box.
> 
> Native bridging is a different thing than transfering.  When an
Asterisk
> box "transfers" the call it actual gets the two remote IAX peers to
rather
> talk directly and sees nothing more of the call (in an IAX trace
you'll
> see TXREQ (transfer request) frames and similar).
> 
> "notransfer" is about enabling and disabling this feature.
> 
> Native bridging is just where chan_iax2.c uses an optimised "quick
copy"
> function to pass frames between the input and output iax connections.
> 
> Native bridging will be done whenever two IAX channels are bridged
> together and both use the same codec etc.
> 
> There's no config file option to enable or disable it.
> 
> If you don't want native bridging, you need to disable it in
chan_iax2.c
> by undefining BRIDGE_OPTIMIZATION.  If you do that, then your box will
> probably hear and act on the # transfer request.
> 

Thanks Steve, have done as you suggested and it works perfectly.  Would
this be considered a bug since the T or t directive in the dial plan
probably should preclude native bridging if the end result is to prevent
a transfer?