Extension to Extension and outbound one way voice issue

hi all,

I am stuck in to a strange issue.

I have installed the server on AWS and now extension to extension calling is not working fine not even outbound calls are working fine.

however on some networks extension to extension and outbound calls are working fine.

whereas on one of our network in italy I am having one way voice on both extension to extension and outbound and also on inbound numbers.

while on other network it’s working fine It’s really strange. I just can’t figure this out.

need help from everyone.