[asterisk-dev] Performing an attended transfer

[peter ellis]

Hi Guys

I need to perform an"Attended Transfer" via asterisk where I can
utilise the phones themselves to perform the workload. If i use the -t
flag to perform a transfer then I am increasing the work load that
asterisk has to perform but not only that the major issue is that the
bandwidth as it doubles when attempting to handle the transferring of
calls (this is obviously a limitation for us as the number of
concurrent calls drops as this operation sucks bandwidth when talking
to asterisk to perform the transfer).
I assume this is so that asterisk can pick up the DTMF tones!???
Anyway in the ideal world i simply want the transferring phone to say
"asterisk whats the ip of the phone im trying to transfer to...."
asterisk tells the phone and the phone performs the rest of the
transfer operation.

I have located solutions for this online with answers including....use
meet me rooms or parked calls.

However neither of the above solve my issue and both are still heavy
weight operations ...and again i loose bandwidth.

I guess i simply want to simulate how my aastra 480i performs a xfer
...thats it when i press the xfer button..... then this is ok its just
the way asterisk does it.

We have discussed manipulated the SIP Headers but this is a very last
option for us.

Any help in this matter is greatly appreciated... i know a lot of
developers have been asking about this functionality!

If you need any other information about this problem from me or extra
clarification then please feel free to email me back.

Kind Regards

Peter

p.s. here is an example of someone else asking something similar...

http://lists.digium.com/pipermail/asterisk-dev/2005-October/015983.html