[VoiceOps] Call Forwarding is broken; or, when CF meets LCR

Nathan Anderson nathana at fsr.com
Mon Mar 18 19:27:35 EDT 2013

On Monday, March 18, 2013 12:20 PM, Lee Riemer <mailto:LRiemer at bestline.net> wrote:

> Diversion header?

I already tried that:

> On Saturday, March 16, 2013 1:29 AM, Nathan Anderson <> wrote:
> > 2) When a call forward occurs on the PSTN, RDNIS/RGN (forwarding number)
> > is typically included in the SS7 signalling at the final switch.  There
> > are a couple of SIP header fields that people have conjured up to fill a
> > similar role: Diversion (which was described in an IEFT draft and has
> > seemingly become a "de facto" standard of sorts, much like
> > Remote-Party-ID was before PAI arrived), and History-Info (which actually
> > made it into an RFC, 4244).  Perhaps, in the event of a forwarded call,
> > it would make sense for term providers to use Diversion or History-Info
> > to inform them of what to use as ANI.  I attempted to send calls out with
> > one field or the other included in the header, but it made no difference:
> > either PAI (if present) or From (if PAI not present) continued to be used
> > as the sole source for both ANI and CNID.

Nathan Anderson
First Step Internet, LLC
nathana at fsr.com

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