CHEN XUEQIN writes:
4. t_uac_dlg is invoked, send sip REFER message to
Caller Sip softphone,
softphone return 481 Call Leg/Transaction Does Not Exist, so the call
can't be setup.
try sending first invite and when you get back 200 ok, send refer. this
works fine at least with twinkle (linux softphone).
-- juha