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

[Markus Storm <markus.storm@mediaways.net>]

Jay R. Ashworth wrote:
> 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.

Ok, I wasn't precise. The end device *may* set it and the switch *may*
override it (or must, if the number is wrong - though you're right, some
switches nevertheless pass it on). ISDN and H.323 don't differ here.
But since the switch cannot know the full CLID (see below), we *must* 
set it if we want it to be seen as the call originator.

> 
> 
>>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.


Markus


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