[Asterisk-Dev] IAX protocol - how do I transfer a call?

[Matteo Brancaleoni]

get libiax from cvs
or better, use libiax2 (also on cvs)

matteo.

Il ven, 2003-11-21 alle 08:40, Grzegorz Nosek ha scritto:
> Hi
> 
> Thanks very much for your quick reply
> 
> On Thu, 20 Nov 2003 09:06:31 -0600 (CST), Mark Spencer wrote
> > there is an IAX_EVENT_TRANSFER which is a blind trasnfer and 
> > hten you can also use TXREQ to handle supervised transfer.
> > 
> > IAX_COMMAND_TRANSFER just executes a blind transfer "send 
> > whoever i'm talking to to extension foo".  Note that there 
> > is no response, and processing on the call should continue 
> > normally until a HANGUP is received.
> 
> Unfortunately, I can't seem to find IAX_COMMAND_TRANSFER in the source
> (iax-0.2.2 downloaded from ftp.digium.com).
> 
> > 
> > Supervised transfer is more complicated because (unlike SIP),
> >  IAX is designed to be robust against NAT issues.  Therefore,
> >  when you want to natively connect to asterisk calls 
> > together, you send both sides a TXREQ to both sides asking 
> > them to try to connect with their peers.  They each will 
> > send a TXCNT to try to see the other side.  If they can see 
> > the other side, it will send them a TXACC to say "yah i saw 
> > you", then it sends a TXREADY back to the iax client trying 
> > to make the transfer.  When both sides have sent a TXREADY,
> >  a TXREL can be sent which causes them to go ahead and talk 
> > directly to one another.  In the mean time, and if for any 
> > reason the sides can't see one another, the iax client in 
> > the middle must continue to handle the transfer.
> 
> >From the source, I see that I must send remip=%s;remport=%s;remcall=%s
> (iax_header_to_event()) along with TXREQ. Is there a wrapper around
> it? Haven't seen in the code... What exactly is remcall? Is it the
> [d]callno with which the peer communicates with us?
> 
> What part of it is handled automagically by the IAX library? Where
> does the "supervised" part take place (talking to the transfer
> destination)? I understand it's before the TXREQ, right?
> 
> Thanks very much in advance
> 
> > 
> > Mark
> > 
> 
> Grzegorz Nosek
> 
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Matteo Brancaleoni
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