no cable entry on front of a bell box.i take its an old system so you will have to replace the rusty bell box with a plastic one there are lots out there but you must be carefull falling off a ladder is no fun,call an engineer out ,its safer and he will advise you on what box to fit,its just not a case of removing the cover,when u do that you will create a tamper that you may not b able to reset
gts, February 2016