770f064d36025d48494c5207c2032aaf7664f72a
Copy most visiblity logic from the Dialer app We should check whether RTT is supported or not by querying Telecom. Also, the rtt configuration won't be initialized properly before user goes into the RTT page. Prior to this cl, we set a wrong default value when we're showing the subtext of RTT, this is not correct. Currently, we simple show nothing in subtext if RTT haven't initilized properly. Test: Work with testing team to verify the behavior. Fix: 188110773 Change-Id: I47c1983d15e22ef5a1fb3027334117a38a479558
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