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Jabber for windows Call connects but no media , STUN Binding indication

hi guys

 customer infrastructure is CUCM10.5+CUPS10.5+EXPRESSWAY8.7,

  there is one computer have a problem, when in the  internal network ,his jabber for windows client can call connects but no media to ip phone  , call others (other jabber device ) is normal , his account login  other computer the call is OK . 

  in outside network , the client call all be normal through expressway . no matter windows or mobile device .

 i make a capture package in his computer (10.161.50.11 <-->10.161.56.1) , i found there are  STUN Binding indication package cyclicity .is that mean the client will used STUN for internal call ? and is this the reason resulting unsuccful call ?

  is the computer problem or network problem resulting this issue ?

the attachment is the capture package file

pls help ~

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