LRC: call handled too soon

Issue generated from Tuleap's migration script. Originally submitted by: Alexandre Lision (alision)

LRC displays incoming call sometimes too soon. With a poor network, the tls handshake can take some time. During that time the call is already presented in the UI. This is a problem because the outcome of the handshake can sometimes fail. The call should never have been there in the first place.

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