esp32 a2dp sampling frequency support

[us3rname]

Hello, i am using custom a2dp sink library that uses standard a2dp api. I need to lock sampling frequency at 44.1 khz(library supports 96khz and my phone always set it when connecting but my i2s dac support only 44.1khz.) Where is the defintion of a2dp sink supported sampling frequencies or how to answer to a2dp source's set sampling frequency command with error?