asterisk users - Oct 2009 - Confusion on caller-ID with SIP provider

If I have a SIP "provider" (in this case a PBX using SIP trunks), and
I want to send the calling extension number and name as the "from" in
the SIP invite, how do I set up my sip.conf entry for that provider?  I
find the documentation confusing on this point.

callerid=Some Name In From Header <7065551212>

Richard Kenner wrote:
> If I have a SIP "provider" (in this case a PBX using SIP trunks),
and
> I want to send the calling extension number and name as the
"from" in
> the SIP invite, how do I set up my sip.conf entry for that provider?  I
> find the documentation confusing on this point.
> 
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Alex Balashov - Principal
Evariste Systems
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> callerid=Some Name In From Header <7065551212>
So the first part is the NAME and the second the number, right?

But my question was how to have that be information from the CALLERID
channel variable rather than a fixed value in sip.conf.