I have an unusual problem. I have configured two IP trunks configured on freePBX-2.8.1-17,asterisk-11.11.0-0,elastix 2.4. Everything works fine except that sometimes when the user makes an outgoing call, the PBX responds with music on hold. After some testing I found that the problem is related if the destination number is congested or have damaged the line. The phone provider sends a message when one of these events happens, but Elastix does not communicate this message, unlike sends music on hold.
This suggests to the user that Elastix has a problem, but in reality is just a congestion problem line or line damage.
How I can fix this? As Elastix can detect and notify the event correctly or to supply the error message supplied by the phone provider?