My FreePBX server was a few versions behind, so I updated it. It all went very smooth, but now FOP won't transfer calls. I upgraded to 2.28, erased the management module from FreePBX. (love the web based config) It functions well, I feel like there is a disconnect between FOP and Asterisk that I can't put my finger on. The config files all have transfers turned on, as I have read older threads with similar problems.

I also upgraded Asterisk to version 13. Not sure if that caused some of the problems.

What can I do to debug this problem?

Same problem for me. Asterisk 12.6.1 FreePBX 12.0.13 Ubuntu 14.10 FOP 2.28. Not working transfer (blind and attended) and no sound (and not working mic) in 'listen&whisper' mode for conference (the button listen and 'listen&whisper' are working).

You can roll back to Asterisk 11 by running asterisk-version-switch and choosing 11. I just did that after having this problem and the buttons started working.

OK, pls give me URL to FOP 2.29 Beta (Debian/Ubuntu x64). And what to do with the activation code.
I have the key to 2.27. Two weeks ago I bought a key for upgrade to 2.28 (on main page fop2.com claimed that supported Asterisk 12).
How to deal with the new version 2.29?

Hi, I'm having the same issue: call transfer and pickup do not work with fop2 2.28 and FreePBX 12. However after upgrading to 2.29 beta (the CentOS version, I get the following error when running "/usr/local/fop2/fop2_server --test":

Flash Operator Panel 2 - White Label Version.
unable to initialize libusb: -99
Flash Operator Panel 2 - Valid License (7)

ERROR 1102 (42000) at line 1: Incorrect database name ''
ERROR 1102 (42000) at line 1: Incorrect database name ''
Connection to manager OK!

And no buttons display in fop2.
Any ideas?

The autoconfig-users runs fine, but the autoconfig-buttons doesn't:

./autoconfig-buttons.sh
# Problem connecting to mysql

! Cannot connect to Fo2 Manager database

This is what it looks like now:

if [ -e /etc/freepbx.conf ]; then
DBNAME=`cat /etc/freepbx.conf | sed 's/ //g' | grep AMPDBNAME | cut -d= -f2 | tail -n1`
DBUSER=`cat /etc/freepbx.conf | sed 's/ //g' | grep AMPDBUSER | cut -d= -f2 | tail -n1`
DBPASSLINE=`cat /etc/freepbx.conf | grep AMPDBPASS | tail -n1`
DBSTRIP=`echo $DBPASSLINE | cut -d= -f1`
DBPASS=`echo $DBPASSLINE | sed "s/$DBSTRIP=//g"`
DBHOST=`cat /etc/freepbx.conf | sed 's/ //g' | grep ^AMPDBHOST | cut -d= -f2 | tail -n1`

Hello, transfer is now working, but no sound in listen/whisper mode. If cal to 555 (freepbx spy channel) + number extension - all good.

All the same, there is no sound. Output for asterisk -rx "core show channels concise" with and without force_parameter_delimiter=','

DAHDI/pseudo-922601214!default!s!1!Rsrvd!(None)!!!!!3!47!!1418758260.206057
DAHDI/i2/889658064166-31d!from-internal!STARTMEETME!4!Up!MeetMe!201,oTMr,!89658064166!!!3!30!!1418758277.206075
DAHDI/pseudo-2103507193!default!s!1!Rsrvd!(None)!!!!!3!47!!1418758260.206059
DAHDI/i2/88162280360-31c!from-internal!STARTMEETME!4!Up!MeetMe!201,oTMr,!88162280360!1418758252.206045!1418758252.206045!3!56!!1418758252.206045
SIP/1002-00000317!from-internal-increase-vol!!1!Up!ChanSpy!CONFERENCE/201,dq!1002!!!3!12!!1418758295.206085

No sounds in spy mode (listen / whisper) only in conferences. Button listen / whisper work well with other internal numbers. If i call 555 + number conference sounds is good, but it is inconvenient for the user.

About spy in conference understand.
I have error with blind transfer from user in queues to conference - after transfer incoming call to conference, sip line of user form queues is not released. The line of user remains busy until incoming call not complet.

Incomming call (from dahdi) -> direct to SIP extension -> blind transfer to conference = all ok - external call in conference and SIP extension line released.

Incomming call (from dahdi) -> queue -> SIP extension -> blind transfer to conference = problem - external call in conference but SIP extension not released line.

Screen in attach.