We should support the sip protocol markdown such as ```[call me](sip:danmar@microsoft.com)``` Related to https://github.com/Microsoft/BotBuilder/issues/1103
We should support the sip protocol markdown such as
[call me](sip:[email protected])Related to microsoft/botframework-sdk#1103