[asterisk-users] How to config SIP blind transfer in extension.conf

[Lucian Romi]

I want to setup a blind transer for auto forwarding to SIP peer.

I have context forwarding looks like this in extension.conf

[forwarding]
...
exten => 511,1,Dial(SIP/sip_proxy-out)
...

This will do the re-invite, which is attendance transfer maybe.
But I want a blind transfer by REFER method. How can I do that?
I know that the transfer() function may be able to do that. But I don't
know the syntax for that.
I tried
"
exten => 511,1,Transfer(SIP/sip_proxy-out)
"

So can any one give me a hint on this? Thanks!
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