sorry for my english!
I have the same problem with asterisk 1.4:
Thread -1228571728 Blocking ‘SIP/904-0820db78’, already blocked by thread -1228325968 in procedure ast_waitfor_nandfds
the PlayDtmfAction is ok and response of managerApi is:
message=‘DTMF successfully queued’; response=‘Success’
Nothing for the operation
Have you got a solution ?
Thanks for help !!!