sips_transport_ice: detect dead connections

If a TCP timeout occurs, the ICE session will emit a signal. SipsIceTransport
should handle this case to avoid video freezes

Change-Id: I1294606fd51283c03fd0d0cd1a966b4840f2b312

src/jamidht/sips_transport_ice.cpp

@@ -232,6 +232,10 @@ SipsIceTransport::SipsIceTransport(pjsip_endpoint* endpt,
     };
     tls_ = std::make_unique<TlsSession>(std::move(iceSocket), param, cbs);
 
+    ice_->setOnShutdown([this]() {
+        if (tls_) tls_->shutdown();
+    });
+
     if (pjsip_transport_register(base.tpmgr, &base) != PJ_SUCCESS)
         throw std::runtime_error("Can't register PJSIP transport.");
 }