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Yeastar S20 calls not working

Hello,

I am using S 20 with SIP lines. the problem is when an outgoing call is made to external number, the call reaches the destination but there is no sound once the destination receives the call. For example I am calling from my extension to my mobile phone, I receive the call on my mobile but after answering the call, there is no sound. 

For incoming calls when I am dialing the landline number, there is no IVR and also keypress event isnt working as well. 

i have no clue why suddenly it stooped working as it was working till few hours ago. 

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