First we added a Menu action and set its properties as follows:
On the Touch Tones tab we set the Wait for a key press for option to 5 seconds. This gives the action a Timeout result which can be used if the caller does nothing or doesn't has DTMF dialing.
Our IP Office has extensions and groups numbered in the 200 to 299 range. So we added the touch tone sequence 2?? to match any dialing in that range.
In Entry Prompts we recorded a prompt along the line of "Dial the number you want or wait for reception".
We added a Transfer action. In its properties, on the Specific tab we set the Destination to Main, the hunt group containing our receptionists.
We then added a connection from the Menu action's Timeout result to the Transfer action.