Twilio app to app Call When App closed or killed in Android?

I have done All Registration step from twilio client SDK for app to app call and i have successfully established call with two device. i am happy with twilio client SDK integrate with our server setup.

See Below Logs When successfully Connection.

06-15 10:27:41.268 12325-12742/com.twilio.client.quickstart D/CallControlManager: account information : com.twilio.client.impl.session.Account@ca8c233
06-15 10:27:41.268 12325-12742/com.twilio.client.quickstart D/CallControlManager: onRegistrationState for Account id: 1
06-15 10:27:41.269 12325-12742/com.twilio.client.quickstart D/CallControlManager: RegistrationInfo Code 200
06-15 10:27:41.269 12325-12742/com.twilio.client.quickstart D/CallControlManager: RegistrationInfo success true
06-15 10:27:41.269 12325-12742/com.twilio.client.quickstart D/CallControlManager: RegistrationInfo expiration 100
06-15 10:27:41.269 12325-12742/com.twilio.client.quickstart D/CallControlManager: Client registered successfully

See Below Logs When Incoming Call (app is open/running state)

06-15 10:27:59.089 12325-12742/com.twilio.client.quickstart D/CallControlManager: onCallSDPCreated notification received
            06-15 10:27:59.098 12325-12742/com.twilio.client.quickstart D/CallControlManager: Incoming call notification received
            06-15 10:27:59.103 12325-12742/com.twilio.client.quickstart D/MediaManager: playing sound INCOMING as id 1
            06-15 10:27:59.108 12325-13082/com.twilio.client.quickstart D/AwesomeSoundPoolPlayThread: play thread starting
            06-15 10:27:59.115 12325-12325/com.twilio.client.quickstart E/ClentActvity: onResume
            06-15 10:27:59.122 12325-12325/com.twilio.client.quickstart E/ClentActvity: device :com.twilio.client.impl.DeviceImpl@57a00d9
            06-15 10:27:59.122 12325-12325/com.twilio.client.quickstart E/ClentActvity: incomingConnection :com.twilio.client.impl.InternalConnectionImpl@20aaa9e

All things are working fine, Now i need help for How can i manage app to app call in My Bellow Case :

1. When App Closed.
2. When App Killed.
3. When Token Expired.

Thanks in advanced.