For anybody have problems with DTMF codes using OBI200/202 and Ademco Lynx alarm panel (this solution can work with other Ademco alarm panels).
With default ObiDTMF settings there is problem to remote hear/communicate with the alarm panel.
Solution:
1.Login to OBI Talk account.
2. Go to "OBI Expert Configuration"
3. Click "OBI Expert"
4. Go to "Service Providers"
5. Go to "ITSP Profile General"
3. Change DTMFMethod from "OBI Talk Settings" to "Device Default"
In the value column you should see "Auto"