In some cases, we would like to hide numbers from the call record. In this particular case the phone establishes an outgoing call to a service number, which triggers a call transfer scenario if a call is available on a parking slot.
Calling this number does not have any effect if there is no call to pick up.
Thanks to the customisation possibilities of Snom phones almost all these screens and functions are available in XML and can be tailored to our needs.
The attached call_list_lists.xml has a modification to lookup a number in the local phone book; if the called party number exists and it starts with 9# the dialed number will not show up on the PUI. Certainly, other conditions are also possible.
Additional Information how to install the call_list_lists.xml into the phone can be found in the customisation manual.