1. use TE30 ping LYNC server and ok. the network between TE30 and LYNC server was good .
2. capture the packet at LYNC server, the result was
ms-diagnostics: 1000;reason="Final handshake failed";HRESULT="0xC3E93EC3(SIP_E_AUTH_UNAUTHORIZED)";source="VCSSEDLYNC01.VECTRAHOMOLOG.INT"
3. after analysis the logs, the root cause was the user name and password was incorrect .
check all the account and password of the third device .
after correct the all the account and password among AD server , LYNC server and TE30 .
the problem solved.
AD server :