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<div class="moz-cite-prefix">The problem is that the attitude is
then "Oh gee, a bunch of places out there are using a *known*
insecure system as an authentication mechanism, therefore we
should break all the use cases for such capability". Let's not
forget that on POTS lines you could still fake the caller id
number at least by injecting your own signal on the line. I know
I'm probably tilting at windmills here, but I've had too many
legitimate uses broken by providers that wouldn't allow you to
forward that information along.<br>
<br>
-Yossi<br>
<br>
On 07/12/2013 02:11 PM, Steven Ayre wrote:<br>
</div>
<blockquote
cite="mid:CAFiqYu=ydfQKcU1PbZk92==z-MtQK4BOEbP=UUFrKmwaruS_bw@mail.gmail.com"
type="cite">It's all about Caller ID spoofing. If you are allowed
to send anything you could abuse that, and since there are plenty
of services that use Caller ID from the PSTN for authentication
that could be a problem.
<div><br>
</div>
<div>Wholesale carriers might allow it between themselves
(trusted), but it would be undesirable to allow it for
end-users.</div>
<div><br>
</div>
<div>If you actually own the number (such as with DIDs) then
that's a slightly more specific case. If you could prove
ownership to Y & Z and they had a configurable whitelist
then they might be able to add them to the list since they can
then trust you for those numbers, but they couldn't do that for
any random number you might send.</div>
<div><br>
</div>
<div>Proving ownership (and that you still own it) wouldn't be a
very simple task to handle securely though?</div>
<div><br>
</div>
<div>-Steve</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<br>
<div class="gmail_quote">
On 12 July 2013 14:41, Ken Rice <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:krice@freeswitch.org"
target="_blank">krice@freeswitch.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<font face="Monaco, Courier New"><span
style="font-size:11pt">I tend to disagree with that
comment about a decent operator... I find the opposite
to be true... If you have DIDs from say Carrier X, and
you want your calls to be able to go out Carriers Y
& Z and you don’t have any DIDs with carrier Y
& Z how are you supposed to terminate with them...
Even better you have a few DIDs with all of them, you
should be able to send CLID for any of your DIDs out
any of your carriers... <br>
<div>
<div class="h5">
<br>
<br>
On 7/12/13 12:46 AM, "Yehavi Bourvine" <<a
moz-do-not-send="true"
href="http://yehavi.bourvine@gmail.com"
target="_blank">yehavi.bourvine@gmail.com</a>>
wrote:<br>
<br>
</div>
</div>
</span></font>
<blockquote>
<div>
<div class="h5"><font face="Monaco, Courier New"><span
style="font-size:11pt">I have a similar problem.
I set the callerID to the user's extension, so
he knows this is a forwarded call. <br>
<br>
A decent operator won't accept a callerID not
fron your range. I guess you understand why.<br>
<br>
Yehaci.<br>
<br>
בתאריך 12 ביול 2013 07:47, מאת "Shishko" <<a
moz-do-not-send="true"
href="http://shishko69@gmail.com"
target="_blank">shishko69@gmail.com</a>>:<br>
</span></font>
<blockquote><font face="Monaco, Courier New"><span
style="font-size:11pt">Hi,<br>
<br>
when a user redirects its phone to mobile
number, ITSP rejects call because caller id is
not in our range of numbers. If I change CID
to one of our numbers, call is accepted, but
users would like to see original CID .<br>
Is there a way I could deflect a call to ITSP
so user could see original caller id?<br>
<br>
Thanks,<br>
<br>
Denis<br>
<br>
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<div class="im"><font face="Monaco, Courier New"><span
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<pre wrap="">_________________________________________________________________________
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