D-Link DWR-720P - Talk Options; Hold; Release Talk State; Dial Second Number

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2.4 Talk Options
The phone provides some talk control functions during an active call.
During the call, press [Left soft key] to enter [Menu] to access the talk control functions.
2.4.1 Hold / Release talk state
 If network supports, you can hold current call.
 During the call, press [Left soft key - Menu] and select [Hold].
 To activate held call, Press [Left soft key - Menu] and select [Unhold].
2.4.2 Dial second number
 During an active call you can dial another number
 Directly enter the second number and press [Dial key] to call
 Or press [Left soft key - Menu]  [Add new call], enter the number and press [Dial key] to call.
 When the second call is connecting, the first call will be automatically put on hold.