No audio sent or receive

hi friends ,

i am a newbie to sip server and asterisk , i have configured asterisk with latest released . so far with all default configuration only and there is no firewall in my case .

i tried to make call with different sip clients but whenever i call , the call get initiated and also able to receive on the other side too but there is no audio sent or received.

any help would be greatly appreciated

Firewall or NAT. That’s about the best one can say on the limited information available.

Enable rtp debug, and verify if there is no rtp traffic. rtp ser debug on also is needed that you post your sip configuration and the Asterisk CLI or log information