Hi,
I have a question about implementing call transfer using sofia-sip.
I noticed that "Notifications can be automatically generated actions when
nua_invite() is given referrer's nua handle in NUTAG_NOTIFY_REFER()." In API
doc, it also mentions that "It should also pass the event header object
along with the handle using NUTAG_REFER_EVENT".
So I further looked at the API doc of NUTAG_REFER_EVENT. It says:
"The nua_i_refer event will contain a suitable SIP event header for the
notifications in the NUTAG_REFER_EVENT() tag. The application should store
the SIP event header and when it makes the referred call, it should pass it
back to the stack again using the NUTAG_REFER_EVENT() tag."
However, I don't really get its meaning. Thus, I use sip_event_make method
to construct a event header instead, and then pass it to nua_invite as
follows:
sip_event_t *event = sip_event_make(su_home, "refer");
nua_invite(op_cn->op_handle,
NUTAG_NOTIFY_REFER(nh), NUTAG_REFER_EVENT(event),
TAG_END());
However, as it works out, my referrer only gets NOTIFY of 100 trying and 180
ringing. Though the referee successfully establishes a call session with
refer target, my referrer never gets the NOTIFY of 200 OK.
Therefore, I would like to ask that is it by design? Or I made a mistake for
the event header for the NUTAG_REFER_EVENT()?
--
Best Regards
Tan Miaoqing
Master's Programme in Mobile Computing - Services and Security
Helsinki University of Technology
http://users.tkk.fi/~mitan
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