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The telephone queries the TFTP server, which transmits a script file to the telephone. This script file, at a minimum, tells the telephone which application file the telephone should be using (the application file is the software that has the telephony functionality, and can be easily updated for future enhancements).
The telephone uses the script file to determine if it has the proper application file. A newly-installed telephone may have no application file, and hence may not have the proper one. A previously-installed telephone may or may not have the proper application file. In any event, if the telephone determines it does not have the application file the script file says the telephone should have, the telephone requests a download of the proper application file from the TFTP server. The TFTP server then downloads the file and conducts some checks to ensure the file was downloaded properly. If the telephone determines it already has the proper file, it proceeds to the next step without downloading the application file again.
After the application file has been checked and loaded, if appropriate, the 4600 Series IP Telephone also uses the script file to determine if there is a settings file containing options you have administered for any or all of the 4600 Series IP Telephones in your network. For more information about this settings file, see Administering Options for the 4600 Series IP Telephones.
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