[SIPForum-discussion] SIP original A-number

[Blake Coleman]

The diversion header gets populated from the redirecting number(OCN).

I've seen/heard many PBX systems that can't do a redirecting number.  
That's tough to make calls work properly.



Blake

On Aug 27, 2008, at 1:38 PM, "Singleton, Andrew R." <ANDREW.SINGLETON at mcleodusa.com 
 > wrote:

> The key is diversion header, your application server needs to be  
> able to route advance on diversion.  I think some do this with  
> history-info but not 100% sure on that one.  We use diversion.
>
>
>
> 333-3333 = Cell phone from external source
>
> 111-1111 = Customers desk phone (find me follow me, or call forward  
> to 222-2222)
>
> 222-2222 = customers cell phone
>
>
>
>
>
> 333-3333->111-1111->222-2222
>
>
>
> In ISDN world you have:  OCN, original called number, calling party  
> number, called party number and Redirecting number.  In our example:
>
> Calling party number:  333-3333
>
> OCN = 111-1111
>
> Called party number = 222-2222
>
> Redirecting number = 111-1111
>
>
>
> SIP:
>
> From = 333-3333
>
> To = 222-2222
>
> Diversion Header = 111-1111 (I believe populated from the ISDN OCN  
> or Redirecting number, not 100% sure here.  Or if not ISDN, as in a  
> IP PBX, this should be populated by the customer prem based equipment)
>
>
>
> There are other field but these are the important ones.
>
>
>
> The diversion header is the key.  So as long as the customers  
> equipment populates the diversion header information, we are good.
>
>
>
>
>
> From: discussion-bounces at sipforum.org  [mailto:discussion-bounces at sipforum.org 
> ] On Behalf Of Jimmy Svensson
> Sent: Wednesday, August 27, 2008 9:55 AM
> To: discussion at sipforum.org
> Subject: [SIPForum-discussion] SIP original A-number
>
>
>
> Hi!
>
>
>
> Is there any features in SIP to enable show original A-number? Any  
> special fields that can be used?
>
>
>
> We as an operator use SIP-trunking to connect enterprise PBXes and  
> see a demand to display the original A-number when doing an external  
> forwarding. In this case someone calls an extension in the PBX that  
> is forwarded to an external number. A new call leg is created to  
> call this external number, here I want the original A-number to be  
> shows as From but this is not allowed because of A-number-validation  
> in our application server.
>
>
>
> Any good solutions/workarounds?
>
> Thanks!
>
>
>
> Jimmy Svensson
> Network Engineer
> Technology Planning
>
> TDC Sverige AB
> Box 799
> SE-191 27 SOLLENTUNA
> Tel +46 8 563 101 23 dir.
> Tel +46 8 519 810 00 vxl.
> Mobil +46 701 81 01 23
> Email jimmy.svensson at tdc.se
> Web tdc.se
>
>
>
>
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