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VCS 8.1 and Lync 2013 deployment

hello all,

is there a little problem regarding with vsc to Lync deployment.

in our network;

vcs control 8.1 and Lync 2013 are working properly for local calls (endpoint, mcu, tpserver)


microsotf interoperability key was installed to VCS Control

Lync servers were enabled and added to VCS Control as B2BUA trusted host


However the Lync Clients that are outside of network can not call inside devices.

In deployment guide, they mentioned vsc exspressway must be configured as TURN server in vsc control. 

but there should be some configurations for vcs expressway and lync server am I wrong?

thank you.

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