Sony SRS-BTS50 - Manual (Page 90)

Tips
To only make a call on a BLUETOOTH mobile phone that has a music playback
function, select HFT or HST on the mobile phone, not A2DP.
With some models, if you connect with HFP or HSP, an A2DP connection is also
made. In this case, you cannot connect the system with other music players.
Note
To connect the system with the same 2 devices again after you finished using
them, repeat the connection procedure noted above again.
Related topic
Pairing and connecting with a BLUETOOTH device
Pairing and connecting with more BLUETOOTH devices
Connecting with a paired BLUETOOTH device
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