Web User Interface
Action URL Settings - Action URL Settings (Section): Attended Transfer
Phone User Interface
Initial Firmware Version
This event will be triggered on the phone (A) which received the REFER message during an attended transfer. Usually this is the calling party (A), while B is the called party, that performed the transfer and C is the party the call is transferred to. Compare this SIP call flow. In this case a web GET to the specified URL is performed.