Avaya IP Office SIP trunk doesn't process inbound calls with hidden CLID

[mic501]

I just noticed that all IP Office customers connected with SIP trunks cannot receive calls when the caller hides the caller ID.
I see coming in the monitor trace but IP Office does not respond to messages.
Does anyone know which of the parameters in the SIP trunk might be causing this behavior?

 

[critchey]

Are you sure you don't have an incoming call route setup for withheld/anonymous? If so you just need to remove that ICR or route it how you want it routed.

The truth is just an excuse for lack of imagination.