thank's x-man.
i have installed FAC of 'use flash',for example:111
you perform call to my cell phone (my cell phone is external hotdesking),i pick up on my cell phone and converse,i want transfer call to extension number 555(extension number of ICP system),i dial 111,i get tone transfer,i dial 555,i hangup,this time you will music on hold and no transfer to 555,I hope you can help me.