157.OFCOM may set conditions to be complied with by persons who are not communications providers in respect of the allocation, transfer and use of telephone numbers. The duty will be enforceable by OFCOM in civil proceedings. OFCOM must comply with sections 47 to 49 when setting, modifying or revoking any telephone numbering condition which applies to non-communications providers or giving, modifying or withdrawing any direction, approval or consent given by them for the purpose of any condition.