## Requirements

To enable the Push interface, the non-null parameter TPSLIST (Trusted Push Server List) must be administered in the 46xxsettings.txt script file on the HTTP server.

NOTE: The 46xxsettings file is used for both 9600 Series and 4600 Series IP Telephones.

Use the SUBSCRIBELIST parameter to define the list of subscription servers to which all the telephones will subscribe. The SUBSCRIBELIST parameter is not required to send Push Messages. The remaining sections in this chapter discuss these two topics in more detail.