[Freeswitch-users] Using reason header from SIP 183 message inside dialplan

[Bunea Lucian]

Hello,

I have a Vodafone SIP trunk connected to my freeswitch box.
Everything works fine excepting one thing: I am unable to differentiate 
when a dialed number is busy or unavailable (line disconnected, mobile 
phone out of coverage area, &c).
My provider signals this kind of situations inside a SIP 183 Session 
Progress message with reason header (user busy, subscriber absent, ...).

How can I use/get that reason header inside dialplan?

Sofia log uploaded here: http://pastebin.freeswitch.org/22101

Regards,
Lucian