[from-pstn] include => from-pstn-custom ; create this context in extensions_custom.conf to include customizations include => ext-did include => from-pstn-timecheck ; this has to be included otherwise it overrides ext-did [ext-did] include => ext-did-custom exten => 12143294838,1,Goto(from-pstn,s,1) ; exten => 2143294838,1,Goto(from-pstn,s,1) ;