Re: [stir] Call Forward/Follow-me

I think that History-Info should be the solution going forward, certainly
for SIP networks.

- Alan -

On Fri, Jun 7, 2013 at 1:17 PM, Rosen, Brian <Brian.Rosen@neustar.biz>wrote:

> A problem that has been noted is PBXs and other services that implement
> Call Forward and Follow-me by spoofing From to be the original caller when
> they originate a call from the PBX to the ultimate destination.  They do
> this so that the called party sees the original caller when they get the
> call.
>
> If we outlaw spoofing, these services wouldn't be able to do that.  They
> would have to use History or other headers to pass the original calling
> party number.
>
> I believe that we can't continue to allow this kind of spoofing.  There
> are other headers which are appropriate for use.
>
> One of the arguments given is that in older systems such as POTS or 2G/3G,
> there is no way to get caller ID to show data from the other headers.  I
> think we have to accept such limitations.  Newer systems would not have
> that problem of course.
>
> While it may be unfortunate that something like forward or follow-me
> doesn't work as well as it did, I think that it's the right tradeoff.
>
> Please note that there are another class of calling party number spoofing
> circumstances we CAN do something about.  Suppose a doctor wants to place a
> call on her mobile that appears to come from her office number.  In that
> case the doctor can authorize the service that arranges that call.  They
> can get the cert for the office number and authorize the service to place
> calls with that number by giving them a cert for that authorization.  This
> also works for, as an example, a call center placing calls for an
> enterprise.
>
> The difference is, of course, that the "spoofed" number is a number
> delegated to the entity spoofing, rather than the forward/follow me case
> where the spoofed number is the calling party and the entity spoofing is
> authorized by the called party.
>
> Brian
> _______________________________________________
> stir mailing list
> stir@ietf.org
> https://www.ietf.org/mailman/listinfo/stir
>