Why call was not routed through other provider/trunk?
If you see that a call was not routed through the second (third/fourth/...) Provider/Trunk, take the following steps:
1. Check Call Tracing – it is possible that other Providers can't handle the call (no rates, not configured properly, not assigned to LCR, etc).
2. Call hangup cause is not FAILED. (Next provider is used ONLY when call hangup cause is FAILED). Check STATISTICS –> Calls –> Last Calls – check Hangup Cause for your failed call. If the Hangup Cause is NO ANSWER or BUSY, then MOR does not route the call to the next provider. More details here.