asterisk users - Mar 2006 - Attended transfers timing out after 3 rings

Hi,

Using  1.2.5 with attended transfers, we are finding that dialling the 
transferee is timing out after only 3 rings, after which the original 
caller is transferred back.

I have searched high and low but cannot find anywhere to increase the 
timeout for dialling the transferee.

This is a big problem for us, so any help is much appreciated!

-- 

-Barry Flanagan