09:14:43,960 ERROR [tech.ivoice.sip.telephony.IvoiceCallManager] SipApplicationSession already invalidated !: java.lang.IllegalStateException: SipApplicationSession already invalidated !
    at org.mobicents.servlet.sip.core.session.SipApplicationSessionImpl.getAttribute(SipApplicationSessionImpl.java:363) [sip-servlets-impl-3.2.0-89.jar:3.2.0-89]
    at org.mobicents.servlet.sip.message.MobicentsSipApplicationSessionFacade.getAttribute(MobicentsSipApplicationSessionFacade.java:163) [sip-servlets-impl-3.2.0-89.jar:3.2.0-89]
    at tech.ivoice.sip.telephony.IvoiceCallManager.onReceive(IvoiceCallManager.java:96) [classes:]
    at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:159) [akka-actor_2.10-2.1.2.jar:]
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:425) [akka-actor_2.10-2.1.2.jar:]
    at akka.actor.ActorCell.invoke(ActorCell.scala:386) [akka-actor_2.10-2.1.2.jar:]
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:230) [akka-actor_2.10-2.1.2.jar:]
    at akka.dispatch.Mailbox.run(Mailbox.scala:212) [akka-actor_2.10-2.1.2.jar:]
    at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:506) [akka-actor_2.10-2.1.2.jar:]
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:262) [scala-library-2.10.1.jar:]
    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) [scala-library-2.10.1.jar:]
    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1478) [scala-library-2.10.1.jar:]
    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104) [scala-library-2.10.1.jar:]