Reading this paper from Cisco's web site,
I found in the Standards Support part, regarding rfc 3892 this foot note:
"7 Invite with Replace implementation is limited to transfer."
Does anybody know if extending this feature to other call flows is in the road map of any development path? Particularly I see this feature useful to enable allowing call pickup of calls from pstn to sip,for example, which requires accepting an Invite with replaces header without previous refer transaction involved.