FreePBX connectivity issue with Alcatel OXO

I am having trouble configuring FreePBX and Alcatel OXO. Have some configuration working that I can call OXO extension from FreePBX extensions and vice versa. from FreePBX call connects to OXO extensions within nano second but from OXO extension to FreePBX it is taking around 30 seconds to reach to extension. Both outgoing external calls and incoming external calls are ending up to OXO attendant (Receptionist). Do not have enough knowledge of Dialing plans. If someone can plz help in resolving the issue and if some guide/link can be provided to understand Dialing plans and OXO routing, would be great help.

Thank you So much.

These are screenshots from FreePBX.