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Some special configurations are available in the app json for a phone app: pickupHook and hangupHook.
With those two options enabled, the user will get instant feedback in the Upsales UI once a call is picked up or hung up.
Simply add the "phoneConfig" property to your apps json to let Upsales know you'll be using those webhooks.
"phoneConfig": {
"pickupHook": true,
"hangupHook": true
}