S20 Behind Mikrotik

i have setup s20 to facilitate calls within the offices and over WAN to connect to other yeastar PBX's. locally i can make calls , then other sites can reach the extensions registered on s20.. The S20 is behind the mikrotik router.. problem is that exten on s20 cannot call other extensions on other yeastar PBX's.. 

could i be missing a setting somewehere??


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