Yealink T28 setup audible ring on 2nd incoming call

[JeffWilkinson]

Hi,

I have a receptionist with a T28 that is configured to accept multiple calls.
When 1st call comes in the phone rings as per normal.
While the receptionist is online with 1st call, a 2nd call comes in.
Only a light on the phone indicates that there is a new call coming in.
If she is not looking at the phone, she has no idea there is a 2nd call waiting to be answered.

How can I set the phone to "Ring" on the 2nd, 3rd incoming call etc.

Thanks in advance
Jeff

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Sorry forgot to mention the phone firmware.

Firmware v2.61.0.80
Hardware v1.0.0.39