IMG 1010 - SIP Redirect - IW Call Diversion Info to SS7

When a call is Redirected (also known as Call Forwarding), the called party redirects the call to a third party. The redirecting could be the result of the line being busy, the called party configured for call forwarding, or a host of other reasons. When the call is redirected, the ACM and/or CPG backward call messages will be mapped back to the SIP leg in either the Diversion or History-Info headers. The parameters that will be mapped are displayed in the table below.

...

In the Call Flows below, the call is first sent to the SS7 User. The SS7 User is configured to redirect the call to the Redirected User and redirects the call. The SS7 User also sends either an ACM or CPG message in the backward direction with the redirection information. The parameters in the ACM or CPG message will determine how the redirecting information will be mapped back to the original SIP User. Also, the IMG can be configured to map the parameters back to the SS7 User in either the SIP Diversion Header or SIP History-Info Header.

Call Flow 2 - ACM mapped to 183 Progress

...