// Is there a session active
if (currentcall) {
    log("TROPO_EU_TESTERS, incoming call");
    if (currentcall.network === "VOICE") {
        log("TROPO_EU_TESTERS, incoming call, network:VOICE");
        say("Thanks for joining Tropo Europe Testers service.");
        wait(1000);
        say("We welcome your responses via SMS for now");
        hangup();
        return;
    }
    if (currentcall.network === "SMS") {
        log("TROPO_EU_TESTERS, incoming call, network:SMS");
        say("Thanks for joining Tropo Europe Testers service.");
        wait(1000);
        say("We welcome your responses via SMS for now");
        hangup();
        return;
    }
    log("TROPO_EU_TESTERS, incoming call, network:UNKNOWN");
    say("Sorry we cannot process your message");
    hangup();
}

// No call active, a new session will be started
else {
    log("TROPO_EU_TESTERS, no current session, outgoing call");
    // Start an SMS session
    call(testernumber, { network:"SMS" });

    // say("Hi Tropo Europe Tester, this SMS with trackID: " + trackID + " was delivered via: " + country + ". Please check the sender number is " + troponumber + ". If yes, respond and include your trackID. For example: received " + trackID + ". If no, send an SMS to XXXX");
    var trackID = 12345;
    say("Hi Tropo Europe Tester, sms [trackID:" + trackID + "] was delivered from: Canada, please respond CORRECT or WRONG to " + troponumber + " if the sender number is " + troponumber + ". Thanks for your contribution to Tropo Europe.");

    hangup();
}