I have an IVR answering calls. If the caller dials a direct extension (for instance 21) within the first two or three seconds after the IVR answers, the call gets routed to a wrong extension (22). However, if the caller waits for about 4 seconds before entering the extension, everything works fine. The box is Elastix 1.3 stable, with ZAP lines and a Sangoma card. What might be going on? I must have some setting wrong somewhere. thanks!