Request Voice Service State of the device

Quick steps: Please follow below steps to get voice service state notifications.

1. Get the PhoneFactory and PhoneManager instances

auto &phoneFactory = PhoneFactory::getInstance();
auto phoneManager = phoneFactory.getPhoneManager();

2. Check if telephony subsystem is ready

bool subSystemsStatus = phoneManager->isSubsystemReady();

2.1 If telephony subsystem is not ready, wait for it to be ready

If subsystem is not ready, wait unconditionally.

if (!subSystemsStatus) {
   std::future<bool> f = phoneManager->onSubsystemReady();
   subSystemsStatus = f.get();
}

3. Instantiate Phone

auto phone = phoneManager->getPhone();

4. Check for radio state

If radio is in OFF state turn it to ON in order to perform any operations on the phone. Either wait for radio to be turned on or else pass the callback to receive the response for setRadioPower

RadioState radioState = phone->getRadioState();
if(radioState == RadioState::RADIO_STATE_OFF){
   phone->setRadioPower(true);
}

5. Implement IVoiceServiceStateCallback interface

class MyVoiceServiceStateCallback : public telux::tel::IVoiceServiceStateCallback {
public:
   void voiceServiceStateResponse(const std::shared_ptr<telux::tel::VoiceServiceInfo> &serviceInfo, telux::common::ErrorCode error) override;
};

6. Instantiate MyVoiceServiceStateCallback

auto myVoiceServiceStateCallback = std::make_shared<MyVoiceServiceStateCallback>();

7. Send voice service state request.

phone->requestVoiceServiceState(myVoiceServiceStateCallback);

8. After receiving voiceServiceStateResponse in MyVoiceServiceStateCallback, the status of voice registration can be accessed by using the VoiceServiceInfo.