Using <transfer> and <disconnect> for GTD Manipulation

The Cisco-specific attribute cisco-gtd is used with the <transfer> element to send GTDs on the outgoing call leg.
<transfer name="gtd_xfer" dest="tel: +1-555-555-0167" bridge="true"
!
!
cisco-gtd="my_gtd"
!
!
/>
It is also used as an attribute of the <disconnect> element to send GTDs during a call release.
<disconnect cisco-disc_cause=”cause_code”
 cisco-gtd=”my_gtd”
!
/>