Hi,
like to know if Asterisk support precondition as specified in rfc3312 ftp://ftp.rfc-editor.org/in-notes/rfc3312.txt?
Regards
astervoiper
any news on implementation of rfc3312 in asterisk ?
None. I haven’t seen any developers in the community decide to implement it. Unless anyone wants to speak up? 
Old thread but I have the same question now.
Does Asterisk support preconditioning?
No. Noone has implemented such a thing.