Can't transfer calls with mobile twinning

 What

I installed the Myportal togo app, configured mobile twinning.. but the smartphone couldn't transfer an twinned call..

 Problem

Can't send DTMF tones over Mobile twinning device.

 Solution

The solution is very easy, you need to go to the Expert mode, choose station, choose the mobility extension and edit the station flags to enable DTMF-based feature activation.