24.4073GPPOriginating Identification Presentation (OIP) and Originating Identification Restriction (OIR)Protocol specificationPSTN/ISDN simulation servicesRelease 8TISPANTS

All outgoing SIP requests are forwarded to an Application Server providing the OIR service under the following conditions:

• the user is subscribed to the OIR service in permanent mode; or
• the request does not include a Privacy header field.