Hi all, We are working on the implemenation of deviceTopology page for the selected end point. we are using DeviceTopology API to update UI. In a process to collect the device topolgy , first we get the point to IMMDevice ie interface for an endpoint and activate the device topology using Activate() function.Using GetCOnnectedTo () funtion we get the pointer to the part connected to this endpoint.When we tried to get the list of all outgoing patrs from this part by using function EnumPartsOutGoing(), it returns E_PROP_ID_UNSUPPORTED. here we are working on VISTA and SOund card is SOUND max with sound max driver. May I know the meaning of this error? Thanks and Regards -Harsha --------------------------------- Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2¢/min or less.