Not just one command... you might want to increase verbosity and debug in asterisk:
asterisk -r
core set verbose 10
core set debug 10
exit
.. and you need to start fop2_server in debug mode:
service fop2 stop
cd /usr/local/fop2
script capture.log
./fop2_server -X 15
then do the call and transfer & transfer & transfer until the error happens.
Then stop fop2 and script:
ctrl-c
exit
You will have the manager log in the file capture.log . At the same time extract the last lines of the asterisk full log :
tail -n 5000 /var/log/asterisk/full/log >/tmp/asteriskfull.log
Those two files will have the relevant information to track the problem and determine if its a fop2 bug, an asterisk bug, a user error, etc... You would want to reduce verbosity and debug in asterisk when you are done and start fop2 as a service again:
asterisk -r
core set debug 0
core set verbose 3
service fop2 start
