Hello, I have a 3cx Phone system 7.1.7139.0. I installed Patton SN 4554 with the good firmware recognized by 3cx. In the advanced parameters of Patton on the 3cx, I notched the options: Support of Re-Invites and Support of ' Replace, this in order to be able to receive faxes via the functionality of the 3cx. Inconvéniant is that because them options notched instead of notching: PBX Delivers the Audio, I do not have more the music of waiting on the calls which forwards by Patton. This problem also existed with version 6 of the 3cx Phone System. Can you help me? Thank you for advance.