HOWTO: fix "Forbidden" from '"Anonymous"

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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