Is your answer based on hands-on experience, feedback
from other
developers/users or something else?
hands-on experience.
In the nanoGSMĀ® EDGE 900 datasheet is not mentioned
the TCH/H support, but
the nanoGSMĀ® EDGE 1800 model seems to support it.
TCH/H != HR
The EDGE models do support AMR-HR. But that's different from HR. And
not supported by osmo-nitb currently.
Cheers,
Sylvain