Special Calls27are available and with which code-number procedure these can be forwardeddepends on the entrance intercom that is connected.All entrance intercom calls are terminated automatically after a certain length oftime has elapsed. This ensures that the forwarding of entrance intercom calls doesnot unintentionally result in a permanent connection (e.g. to a mailbox).The length of time can be set by your system administrator to a value between 30and 300 seconds in the OpenCom 100. Please ask him for the current value.No call forwarding can be set up for doorbells on a SIP terminal.7.9 Keypad DiallingH*12 Z (keypad code digits)For consultation calls:GR*12 Z (keypad code digits)Certain European network operators require the keypad protocol to be used inorder for you to be able to set certain features (this is not the case in Germany).You use the sequence *12 to switch to the keypad protocol, and subse-quently enter the code digits required by your network operator. These are trans-mitted directly to the exchange and evaluated there.You will then generally hear an announcement as confirmation.Standard Entrance Intercom Doorbell151 1 (only for OpenCom 130, 131, 150)152 2 (only for OpenCom 130, 131, 150)153 3 (only for OpenCom 130, 131, 150)154 4 (only for OpenCom 150)“DoorLine” Entrance Intercom Doorbell155 1156 2157 3158 4