[Asterisk-Dev] How to get the transfer number

[Chih-Wei Huang]

On blind transfer, the transferer will be sent to GOTO_ON_BLINDXFR.
However, it seems there is no way for the transferer
to get the transfer number in the dialplan. Is it correct?

I modify the code to set TRANSFER_NUMBER variable to the
transferer channel. For example, if you dial #333 to initiate
a blind transfer, TRANSFER_NUMBER will be set to 333.

Does it make sense? If yes, I'm happy to provide a patch
to bugs.digium.com.