hello. My name is***** can help you with your question.
The model numbers that you mention are just a broad series of handset model numbers. What is the main system that these are connected to? That is what will determine how the programming is done.
That means someone would have to have programmed the system. How you do this will depend on the original programming. It's not function of the phone, but of the Asterisk system. Asterisk is an open source system with various programs, some of them custom.
do you have access to the people that program to the*system? If so, those would be the best people to engage.
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