i tried dlg_bridge, but found some problems.  first, if i didn't define
tm module param fr_inv_timer_avp, i got these kind of errors to syslog:

Jul 22 10:28:53 localhost /usr/sbin/sip-router[15075]: INFO: INVITE 
<sip:[email protected]> by untrusted <sip:[email protected]> from 
<192.98.101.10>
Jul 22 10:28:53 localhost /usr/sbin/sip-router[15073]: INFO: <core> 
[tcp_main.c:1919]: tcp_send: quick connect for 0xb3331098
Jul 22 10:28:53 localhost /usr/sbin/sip-router[15075]: ERROR: <core> 
[usr_avp.c:159]: ERROR:avp:add_avp: 0 ID or NULL NAME AVP!
Jul 22 10:28:53 localhost /usr/sbin/sip-router[15075]: ERROR: tm 
[t_serial.c:430]: setting of fr_inv_timer_avp failed
Jul 22 10:28:53 localhost /usr/sbin/sip-router[15075]: ERROR: Cannot get 
contacts for INVITE <sip:[email protected]:5074;transport=udp>!

nowhere in dialog module docs is mentioned that tm fr_inv_timer_avp
would need to be defined.  is defining fr_inv_timer_avp mandatory in
order to make dlg_bridge to work?

after i defined this avp, and give command

mi dlg_bridge sip:[email protected] sip:[email protected] sip:192.98.101.10:5060

sip:[email protected] rings, but when twinkle answers, it does not receive a
refer. 

when sip:[email protected] then ends the call, by sending bye, i noticed that
bye goes to sip:kamailio.org:5060 (contact uri in invite) although i
have defined

modparam("dialog", "bridge_controller", "sip:[email protected]:5060")

finally, if these issues get solved, is it even in theory possible to
add an "extra headers" parameter to dlg_bridge mi command?

-- juha

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