A communication box assembly includes a base, a plurality of connector mounting inserts, insert mounting means for securing the inserts to an inner surface of the base juxtaposed in an aligned row in a plurality of insert mounting positions, the insert mounting means positioning the inserts with outer insert edges adjacent an outer edge of the base whereby operative ends of connectors carried by the inserts are positioned for convenient connection with office service cables, and a cover releasably attached to the base which is shaped to enclose the base and inserts.