Siemens HIPATH 8000 - Manual (Page 139)

OpenScape Voice functions
139
Step by step
Activating/deactivating parallel call via code
You can activate/deactivate the parallel call without hav-
ing to change to edit mode.
Prerequisite: You have already entered numbers in the
parallel call list.
^
Lift the handset.
j
Enter the code to activate or deactivate the parallel call
(see code table
page 148).