Phone Line 2 connect to second PBX

I need to set up some of phone to connect Line 2 to a second PBX. I can do this by editing the phone’s configuration directly, but would like to do this via EPM if that’s possible.
I see there is a variable line2Dest and associated variables for port number etc in the base template (We are using Grandstream GXP2160 phones), but I cant see where this variable is set from. Am I missing something or do I need to hard code it into the base template?

It’s a feature of EPM already, custom extension:

Great, thank you for the info. I’ll have a play with that.

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