sounds like thats the voice prompt waiting to hear a command from your voice. however, usually there is a mic icon on the screen when this occurs but seems you dont see that
do you have the latest update for the smh5?
and are you saying the unit works fine otherwise in that is plays music, pauses, skips to the next track, etc., but when you want to initiate a call nothing happens other than this "initialising" message?
have you tried un pairing and re pairing the unit?
have you had previous android phones that worked with this unit?
look in the bluetooth tab of the phone under the settings tab and see what profile the phone has setup with the smh5....