provided by Star2Billing S.L.

SOAP client sends initiate conference command to soap_callback_server.php, result is success

Array ( [0] => 3 [1] => result=Success [2] => Success - Callback request has been accepted )

but nothing shows up in the asterisk monitoring console. it looks like the callback server is not instructing asterisk to launch a conference call. Is there anything else to add to the system besides these lines to extensions.conf?

; a2billing conference added
[a2billing-conference-moderator]
exten => _X.,1,DeadAgi(a2billing.php,1,conference-moderator)
exten => h,1,Hangup

[a2billing-conference-member]
exten => _X.,1,DeadAgi(a2billing.php,1,conference-member)
exten => h,1,Hangup

[a2billing-conference-room]
exten => _X.,1,Answer()
exten => _X.,n,NoOp(Start Conference)
;exten =>_X.,n(record),Set(MEETME_RECORDINGFILE=/var/spool/asterisk/meetme/conference_recording-${EPOCH}-${USER});
;exten => _X.,n,MeetMe(${EXTEN},rdTMc) ;Make new Room and record call.
exten => _X.,n,MeetMe(${EXTEN},dTMc) ;Make new Room
exten =>_X.,n,Hangup()

Problem solved.
Took a little while before the callback daemon processed the pending conference.