Wrong Post dialling in digital and Ip extenssions

[aau2]

Hi, I want to send mfc tone from digital and IP extenssions to isdn extenssions, but it doesn´t work. I can do it to digital and analog extenssions when I activate the post dialling, but to isdn extenssions it doesn´t work.
The version is BC.12 SP5.

Any ideas?

Thank you.