[cisco-voip] What's the best way to emulate "clid restrict" on a SIP trunk?

[Robert Kulagowski]

On Tue, Apr 30, 2013 at 12:36 PM, Ryan Ratliff <rratliff at cisco.com> wrote:
> Does this help?
> http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb_9397_ps5640_TSD_Products_Configuration_Guide_Chapter.html

If anything I think it's confused me even more!

In CUCM 7.1.5, if I set Calling Party Transformation -> Calling Line
ID Presentation to "Restricted", I see the following at the CUBE:

INVITE sip:818005312265 at xx.xx.xx.xx:5060 SIP/2.0
Date: Fri, 07 Jun 2013 20:08:44 GMT
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER,
SUBSCRIBE, NOTIFY
From: "Anonymous"
<sip:anonymous at anonymous.invalid>;tag=d465acaa-c4d5-4a79-b7e9-2f1a79e6b2a6-39722697
Allow-Events: presence
P-Asserted-Identity: "Robert Kulagowski" <sip:0000223928 at 10.255.23.7>
Supported: timer,resource-priority,replaces
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Min-SE:  1800
Remote-Party-ID: "Robert Kulagowski"
<sip:0000223928 at 10.255.23.7>;party=calling;screen=yes;privacy=full
Content-Length: 0
User-Agent: Cisco-CUCM7.1
Privacy: id
To: <sip:818005312265 at xx.xx.xx.xx>
Contact: <sip:0000223928 at 10.255.23.7:5060>
Expires: 180
Call-ID: cbdb380-1b213dcc-1521-717ff0a at 10.255.23.7
Via: SIP/2.0/UDP 10.255.23.7:5060;branch=z9hG4bK3f787d83ec26
CSeq: 101 INVITE
Session-Expires:  1800
Max-Forwards: 70

Which is fine.

The problem is that I can't seem get the outbound leg to include the
same RPID and still have the "From" be anonymous. (The RPID is what
will show up in the billing report from the provider so that I can
perform the proper internal billback since this would be in a
centralized SIP scenario)

Is there an easy way to capture the entire RPID from the INVITE from
the CUCM and put it in the outgoing INVITE to the provider?