Callcentric has a special header for this.
header called "Related-Call-ID" that makes it possible for the service provider to check if the Caller-ID is a valid redirection or the caller tries to spoof a caller-ID. AFAIK CallCentric supports this header. A quick try will show this.
From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Ken Rice
Sent: Friday, July 12, 2013 4:30 PM
To: FreeSWITCH Users Help
Cc: FreeSWITCH Users Help
Subject: spam>spam>Re: [Freeswitch-users] Call redirect
Some places actually require clid to be allowed from the customer. Clid spoofing is a problem yes but its not that big of one. Not to mention billing customers based on that is a problem its still easy to spoof. Its like billing on.customer inserted tech prefixes which is ripe for abuse.
The real fix is to start linking back to billing info (btn) like is/was done on tdm networks and you can still properly track things
Sent from my iPhone
On Jul 12, 2013, at 2:11 PM, Steven Ayre <steveayre@gmail.com> wrote: