asterisk users - Dec 2014 - From external IP am not able hear the audio on the SIP extensions

Hi,

In my office have setuped the Elastix machine and i have a static IP
(external IP given by ISP), now the issue is that whenerve call from
outside sip extensions which is register to the sip server , am not able
hear audio from both side.
both callee and caller cant hear audio.

please help me on this

--
Regards
Upendra
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