Pbx for local user that can connect to 2 different node at the demand

It’s pretty easy to setup a trunk. Lots of help out there on the interweb. Here’s one:
http://www.asteriskdocs.org/en/2nd_Edition/asterisk-book-html-chunk/I_sect14_tt670.html

There are a few examples here on Community of how to set up a SIP phone and reverse patch:

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