How to make Chan_SIP extension work with IP phone

I just added an Extension of Chan_SIP type to my Freepbx. But now when I try to connect to it using my IP Phone or Soft phone, the phones/soft phones are not getting connected. What could be the reason and how to solve this?

/var/log/asterisk/full will tell you definitively.

Can you share more information? It could be many things? What do the phones say? Is your network and server setup with the correct open ports?

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