Figure 6: Method 1 - Configure Fxo Port On The Gxw410X: Sip Settings; Figure 7: Method 1 - Configure Fxo Port On The Gxw410X: Dtmf Method; Figure 8: Method 1 - Configure Fxo Port On The Gxw410X: Dtmf Payload Type; Figure 9: Method 1 - Configure Fxo Port On The Gxw410X: Fxo Termination - Grandstream Networks UCM6100 User Manual