Southend on sea's local telephone company, Single and Multi line, ISDN2 and ISDN30. Telephone systems for 2 to 384+ extensions. Business Grade Hosted VoIP. complete range of telephone numbers, freephone 0800, local 0845 and lo-call 0843 and 0844 numbers. We also supply local geographic numbers, we can give you an 01702 numebr that points direct to your landline or mobile without having a landline.