Thanks, this will work, can you provide a little more information on how you set that up?
In EPM, just setup the BLF with the park slot number.
This example, the parking lot is 700 with slots from 701-711
This phone is showing Park 1 through Park 3.
In your case, just label them “Line 1”, etc.
Your example is a Yealink. I have done a lot of testing this works fine on a yealink and grandstream. I can not get this to work on a polycom.