This response means that the response from the client application that does not start with a CON or an END. This includes empty responses or ones that start with spaces before the CON or END.

CON means an intermediate menu; Or that the session is CONtinuing
END  means the final menu and will trigger session termination. i.e the session is ENDing

The expected client response is a string containing the menu to be displayed on the user’s phone. This menu should always start with  CON or an END. Here's an example: 

$response  = "CON Which service would you like to subscribe to?\n";
$response .= "1. Betting Tips \n";
$response .= "2. Bible Verses";

You may read more about this from our sample tutorial on docs.africastalking.com/ussd or talk to our Product Ninjas on support@africastalking.com

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