Text messages (desktop messages) to the idle screen of a Snom deskphone, follow these steps:
1) Configure these the folowing settings on the phone´s phone's web interface:
Support broken Registrar to "on" Filter Packets from Registrar to "off" Network identity (port): 5060 Clear Desktop Message on Cancel --> "off" -> message stays permanently --> "on" -> message can be deleted via "Cancel" key
Also configure an admin password and a http password. If the phone does not have an admin password and http password, the status bar will display the warning messages "Admin Password not set" and "HTTP Password not set" and these will have priority over any other messages.
2) Re-boot (!!) the phone but do NOT reset it!