Shared Line Obligation 44 and 51. Mr. J. Slater asked the Assistant Postmaster-General (1) what classes of telephone subscribers are exempt from the shared service obligation; (2) on what basis decisions are made to compel residential telephone subscribers to accept shared service. Mr. Gammans The only subscribers who are under obligation to share are new and removing residential subscribers since 1st January, 1948. This policy was announced in the House by the then Postmaster-General on 18th December. 1947, and 30th January, 1948, and is being continued by my noble Friend.