thank you for your reply.
I've found what I need at point 17 of the article:
I couldn't change the 2-digit tone code, though...
Please take a look at this article on how to configure incoming and outgoing faxes. If you are still having issues after trying these steps, I suggest that you call into our support department for assistance @ 1-800-821-2797 or 1-800-835-6100
we've connected an external phone to the 6605 and would like to manually receive fax after hearing fax tones. Does the *9* code work also for this machine? If needed where is the option to change it?