If you need to outdial anonymously the call received from SIP trunk on Avaya CM you can see the error message on SIP server
"Forbidden" from '"Anonymous" <sip:anonymous@anonymous.invalid>
First you should fix From: field, because Avaya will accept only registered domain, it should sound like
From: "unknown" <sip:unknown@YOUR.SIP.DOMAIN>
Next step to make call anonymous, Avaya respects SIP header Privacy (see RFC 3325). So you need to send header
Privacy: id
Enjoy!
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