asterisk users - Jan 2013 - Modify from header for anonymous call

Hello,

Our supplier requires the From header of a SIP INVITE to contain certain data so
the call is placed with a private caller id.
It needs to be like this: From: <sip:anonymous at
anonymous.invalid;user=phone>;tag=123455667

How do I configure Asterisk to dial anonymously?

Regards,

Grant
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