Sony SRS-XB31 Help Manual page 59

The sound is output only from the right speaker unit during a call.
Depending on the BLUETOOTH mobile phone, playback may not pause when an incoming call arrives.
Use a BLUETOOTH mobile phone at least 50 cm (1.6 ft) away from the speaker. Noise may result if the speaker and the
BLUETOOTH mobile phone are too close.
If an audio cable is connected to the AUDIO IN jack of the speaker, you cannot listen to music of the BLUETOOTH device.
However, when the BLUETOOTH connection is active, the hands-free function is available.
When using the multi-device connection, you cannot use the hands-free function.
You cannot turn off the multi-device connection function.
Depending on the model of your smartphone, the operation system or applications installed, some functions of hands-free calling
may not be used correctly.
Related Topic
Pairing and connecting with BLUETOOTH devices
Connecting with an NFC-compatible device by One-touch (NFC)
Terminating the BLUETOOTH connection (After use)
Making a call
Switching the BLUETOOTH devices connected at the same time (Multi-device connection)
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