NativeH264EncoderParams defines profile_iop as Byte in NativeH264EncoderParams#setProfilesAndLevel. If highest bit should be set (like in 0x80 for baseline profile 1.2 0x42800C) the check <0 in line 333 prevents that. So 0x42800C announced in SDP becomes 0x42000C in RTP.
NativeH264EncoderParams defines profile_iop as Byte in NativeH264EncoderParams#setProfilesAndLevel. If highest bit should be set (like in 0x80 for baseline profile 1.2 0x42800C) the check <0 in line 333 prevents that. So 0x42800C announced in SDP becomes 0x42000C in RTP.