Sound notifications during a phone call

It is similar problem to the one described in a bug #1290201.
If we receive a sms message during a phone call, we get a normal incomming message notification sound. If You then receive many messages during talking to someone, You have even greater problem to the one described in 1290201. All what You say is accompanied with the sounds nobody wants to hear.

When it happens:
Call someone or answer the incoming call then during it receive a sms message

Expected behaviour:
When talking to somebody our phone should either mute all notifications (as new message or dying battery) or (as Nokia used to do it) notify us in a more discreet and polite manner that only I could hear, not the person I'm talking with.