Quick Configuration for Calling 3.250Telephone Directory SettingThe telephone directory menu is used for configuring the quick dialling buttons (Basicsettings –> Telephone directory). The telephone directory contains 999 positions (only54 positions are supported in the 9137131(CK), 9137161(CK) and 9137111(CK)models, 999 positions are supported after the licence key is inserted, Part No.9137901). The first 54 positions correspond to the quick dialling buttons of 2N® HeliosIP and the buttons of the extending modules attached (see the Mounting - Completion4. Remember to seal the 2N® Helios IP cable passage hole properly to avoid moisturein-leak and damage to electronics due to condensation.5. Make sure that the wires inside 2N® Helios IP are not squeezed and insert theplastic top cover (a transparent plastic mould) carefully making its contacts pluginto the electronics board connectors. Push the plastic cover into positionmoderately. If the part swings over an obstacle or one corner is higher than theothers, remove the cover and find the obstacle. Then tighten the corner screwsproperly.6. Mounting the metal sheet cover follow the steps included in the subsectiondedicated to name plate removal. Make sure that the cover fits well and isperfectly flat. If its bottom part is loose, the mounting wall is probably uneven.Support the corners to avoid 2N® Helios IP bending.Caution An improper mounting may significantly deteriorate the button function. A poor outdoor mounting may cause water in-leak and damage to theelectronics.Most Frequent Mounting ErrorsFor illustration, a part of the plastic cover is removed in the figures below to reveal thesealed loudspeaker and the cover–seal touch point. The cross section plane is markedwhite for better orientation.