Re: [hylafax-users] how to set calling party number ?

["Jay R. Ashworth" <jra@baylink.com>]

On Mon, Nov 04, 2002 at 10:45:29PM +0100, Markus Storm wrote:
> > What is CLID in terms of H323, anyway?  Normally it is provided by the 
> > telco.
> 
> Well, not exactly. H.323 is very close to a digital line (ISDN).
> There's an IE (Information Element) called Calling-Party-Number that an 
> ISDN user's device can set. The telco can verify it (and override if 
> necessary), but the end user device must set it.

*This* depends *entirely* on the switch and the generic which is loaded
into that switch.  Some verify, some just let you set it to anything
you want (though they're really not supposed to...), but I hadn't heard
that you were required to set it.  Myabe that's aan H.323 superset
thing.

> Imagine you have a PBX that has the base number 1234 and 10 telephones 
> attached.
> The telco can check whether the CLID the PBX sends out matches 1234X but 
> it cannot check if X should be 1, 2 or 9 because it only sees the call 
> coming from the PBX. Only the PBX knows which telephone the call came 
> from, so only the PBX can set the full CLID (including X).

And in that case (USAdian Direct Outward Dialling), the switch should
have a validation range (and a default) in it's datafill for the trunk
group.

> > On analog lines the telco sets CLID.
> 
> yes, but on digital ones it's the end user who sets it.

Again: not necessarily,  But if yours does work that way, it would have
to be an ioctl to the ISDN driver, ZI would think -- and faxsend almost
certainly doesn't know how to do that.  If you're using the ISDN
specific sender binary, you should UTSL.

Cheers,
-- jra
-- 
Jay R. Ashworth                                                jra@baylink.com
Member of the Technical Staff     Baylink                             RFC 2100
The Suncoast Freenet         The Things I Think
Tampa Bay, Florida        http://baylink.pitas.com             +1 727 647 1274

   "If you don't have a dream; how're you gonna have a dream come true?"
     -- Captain Sensible, The Damned (from South Pacific's "Happy Talk")

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