How to communicate 2 Asterisk Servers running in a LAN

I configured 2 Asterisk Servers A and B and 2 X-Lite Softphones SP 1 and SP 2 for each of those 2 Asterisk Servers.

   SP 1<------------> Server A
   SP 2<------------> Server B

These Softphones are working properly with their respective servers.

I want to Communicate SP 1 to SP 2 through their respective Servers.

   SP 1 <--------> Server A <------------> Server B <-------------> SP 2

Please help me that how to configure this scenario.

Hello,

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Noel