Hi,
i have option 66 for my phones:
http://192.168.10.1:5000/provisioning
on 5.26 it works, on 6.7 i get error (attach)... to resolve my problems I need to downgrade all my router boards??
works as expected:
http://wiki.mikrotik.com/wiki/Manual:IP ... CP_Options
you have to set 'random text' (note the quotes) if you want to send a string over as an option value.
when everything is set up you can check actual raw value what is going to be sent over.