We are aware that 1 of our carriers has been rejecting outbound calls where the caller ID is withheld resulting in the call failing to setup where the call is routed via this carrier.
We are working with them as to why they are rejecting calls sent in this way. Until then and to ensure calls connect without issue with have assigned non-callable outbound numbers to each account that has an anonymous setup.
Calls returned to this number will be met with a non acceptance massage.