Telephoning Making External/Internal Calls55Your system administrator configures this code digit for all subscribers on theOpenCom 100/OpenCom X300 system and will tell you what value is currentlyvalid.If your telephone is set to automatic line seizure, all call keys on your telephoneseize a trunk line, and you can dial external numbers straightaway. In order toreach internal subscribers, press the star key twice * * before dialling theinternal number.If you hear an external dialling tone when you lift the handset, your telephone isset to automatic line seizure. If you hear an internal dialling tone when you lift thehandset, your telephone is set to manual line seizure. You will find a represen-tation of the audio signals in the appendix of this user guide.For the System Administrator:The code digit is defined in the Configurator, menu PBX Configuration: Trunks:Route (Setting for the External trunk route).2.3.2 Making an External CallWith Automatic Line SeizureH Lift the handset (your call key is seized).and/org Press the particular call key (hands-free mode).and/orK Press the headset key (Headset operation requires that theheadset is switched on, see page 108).Z Dial the external call number.