seems like that when trunks don't send their DID (FROM_DID=s) we can not use any inbound routes on this trunk
- but only use the general AnyDID rule.
it would be very useful to add an inbound route based on available trunks:
"when call received from specific trunk => send to specific IVR"
which is not possible at the moment, and causing an issue, like I wrote, when no DID is received from a IAX2 for example.