Hello PBX gurus,Am seeking some guidance here.
Here is the scenario,

I have a client who wants to interconnect four KX-TDA50s in different locations (Wisconsin-USA,La Romana -Dominican Republic,Port au Prince - Haiti and Miami)through SIP trunks.

My question is what kind of setup will i need (Network requirements)?
Will i need SIP Account for each location?
KX-TDA5480 card?
What changes will i need to make on the PBX and 4-Channel SIP Trunk Card?

Am familiar with KX-TDA Series PBX configuration but never done SIP Trunks with it and will be using PBXUnified Maintenance console ver7.2 (US Version)

I will be grateful for your guidance.