The B-Table include all the numbering plane that the subscriber will call as example if the subscriber call 00201112853 an Egypt number (international) so first its will inserted in the b-number to analyze this number to route it to the correct route( the route include traffic time slots).
The relation between the b-table and the EOS is that an example if the b number was no in the b-table the EOS code will be generated and will be analyzed also in EOS table to generate the correct announcement