SIP transfers

Hello All,
I have an office with 12 SIP clients. They are all using a xten on linux, which I guess doesnt allow for transfers unless you buy the product xpro…which isnt available on linux. But, I should beable to transfer on the * side via the features.conf. I set the "blindxfer=“1*” and it holds the person, but does not give dialtone to transfer.

Is this possible fron the * box? Should I use a different softphone … which one supports transfers?