Thanks HDAWG and Lamo for al your hints.
I have studied the reference guide and the excel file. In both I find only one policy that mentiones BIS; the "Firewall Block Incoming Messages" policy.
When modifying this policy, such that it permits BIS messages to pass through, will it also allow me to set up my BIS account with my provider (Vodafone Netherlands)
At the moment it is not possible to set up a BIS account, I get an error message right after I give my new user name/ password. When click on next, for the next page it will say: "The system encountered an error. Please try again". However trying again will only repeat the error :(
thanks and have a nice weekend!