????? Unity??
depends completely on phone model and it's for CUCM, Unity has nothing to do with this
go to CCO and search ie 7945G IP Phone Administration guide
you will get the link, click on it and on left hand customizing the ip phone.
background instructions and requirements are there.
change the model for what you have
HTH
java
if this helps, please rate
HTH
java
if this helps, please rate