Hello!

According to HSP 1.2 specification, section 4.7 Remote Audio Volume
Control, Support for remote audio volume control is optional, so an
implementation may support none, either, or both of the controls for
microphone volume and speaker volume.

According to HSP 1.2 specification, section 5.3 SDP Interoperability
Requirements, bluetooth device with HSP profile announce via SDP "Remote
audio volume control" field information if device itself supports volume
control.

But currently I did not found any way how to access "Remote audio volume
control" SDP field in (pulseaudio) application as bluez does not export
it.

Can you please export this field? E.g. for HFP profile all optional
features from SDP are passed to NewConnection() DBus method via
fd_properties dictionary under Features key. Could you export that
"Remote audio volume control" bit for HSP profile in Features key?

And in same way, this needs to be handled also in RegisterProfile() DBus
method.

-- 
Pali Rohár
pali.rohar@gmail.com