Is Prack required?

I have not enabled Prack is this anything to do with my present problem?

My problem with Allnet7950 hard phone is that allthough I dial using dtmf when I get the flashing light for a message waiting I can dial 1571 also by dtmf, but when I try to recover the messages the dtmf tones still heard in the earpiece are not heard by the voipfone machine.

I know I had the same problem with an earilier model and this was sorted out by someone on the forum, but cannot remember was it the addition of the G.711 A codec or Prack?

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