Using RPC for Creating a chat Sample Unity - unity3d

I am new to unity ,
I am trying to buid a chat functionality using RPC for Unity.
If one of my device(in which app is installed) is become server and other deivces connect to it, It work fine.
But i want my server to be different machine, in which app is not installed.
I want my all devices to connect to that server.
How should i configure my server such that i can connect to it for a RPC call.

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Thanks, Inci
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If there is a more 'correct' solution I'll amend this.

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