nospam@spammers_are_scum.com declared for all the world to hear...
> I have a fax and data service with orange, and a seperate number for each of
> them, when someone sends me a fax, I want it to go always to the answerfax
> so I can set it to print where I need the fax, but I also want to switch on
> and off a voice divert. I have them programmed as speed dials in the phone,
> one number to setup the other to cancel, but when I cancel I use #21# and
> that cancels the Answerfax divert also.
>
> The phone must be sending a correct code because when the menu is used to
> cancel a voice divert the answerfax one remains.

Leave the answerfax divert alone. Simply use the handset menu to
divert/cancel your voice divert.
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Regards
Jon