If the phone never has been in use in a BP system, you must load a configuration file in the new DBC422 phone, in which the system setting parameter is set for BP system, otherwise the phone wont log on to the IPU board, even if the basic IP parameters are correct.
Files for the IP phones can be downloaded from Aastra Knowledge Base. If you don't have access to the base, you could perhaps ask your service provider.
The phone will fetch new Config and firmware files from a web server via http protocol when the phone is started/re-started.
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