asterisk users - Jan 2005 - caller's identity

I need to understand which is the caller's identity.
I'm tring to use the command named SIPGetHeader in asterisk, to get the
>From Header of the Invite message, but I downloaded the asterisk version
1.0.3 in which this command doesn't appear.
What's the easiest solution of my problem? May I download something else?

Thanks in advance,
Paolo
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