Hi all,
in trixbox 2.2.4 (but I expect the same on other versions) I have:
1) setup a custom trunk celliax
2) setup an outbound route through celliax
3) setup a callback with destination the phone directory or an extension
4) setup an inbound route (any/any) with destination the callback
5) made sure that the context in celliax.conf is context=from-trunk
So, if I call celliax from someother cell|phone, celliax hangup without answering, then it call me back and it connect me to the callback destination (the directory or the extension)
new callbacks how to with screenshots!
Callbacks in Trixbox and freepbx here