[ncc-services-wg] Requirement for fax numbers in LIR Portal

The LIR Portal requires a fax-no: in several places, including initial LIR setup and ipv4/ipv6 allocation forms. Can this attribute be made optional instead of mandatory? Most organisations respond with surprise verging on mild panic when you tell them that they need a fax to be a RIPE NCC member. Does this require a policy change, or is it an operational thing in the NCC? I can't see any policy which makes fax-no: mandatory, but I haven't looked very closely either. Nick