While troubleshooting a Bluetooth issue, you observe that a user's smartphone successfully connects to the car's hands-free kit for voice calls, but music playback over the same connection produces no audio. Volume and input settings are confirmed correct. To restore music streaming, which Bluetooth profile must be available on both devices?
High-quality stereo audio streaming over Bluetooth relies on the Advanced Audio Distribution Profile (A2DP). The symptoms show that voice calling (handled by the Hands-Free Profile, HFP) works, proving the radio link is functioning, but the stereo audio profile is missing or disabled. Serial Port Profile (SPP) provides a virtual COM port for data, and Human Interface Device (HID) is used for peripherals such as keyboards and mice-neither carries stereo audio. Enabling or adding A2DP support on the phone or the car stereo will allow music playback.
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What does A2DP specifically do in Bluetooth connections?
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Why does HFP work for calls but not for music playback?
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How can I enable A2DP on my device if it's not working?