The app will negotiate SRTP even when it is set to disabled on the account.
are you talking about GSWAVE app or webrtc?
is not the app that negotiates, but rather it is the app that has wrong settings and has SRTP activated,
UAC -> INVITE with SRTP offer -> GSWave (configured with SRTP disabled)
GSWave (configured with SRTP disabled) -> 200 OK with SRTP answer -> UAC