CK request from the telephony application server acknowledges the receipt of the message 487 Request Terminated from Carol's UA entity. The following exchanges are identical to those described for CFU (5 to 5.2.1.1.4. CFNL Communication forwarding on not logged-in (CNFL) consists of diverting an incoming call if the callee (Bob) is not logged in with the S-CSCF entity. The different exchanges relating to CFNL are identical to those for CFU. 5.2.1.1.5. CD Communication deflection enables the callee (Bob) to deflect a call if he does not want to answer the caller (Alice). The different exchanges relating to CD are shown in Figure 5.6. S-CSCF P-CSCF Carol SIP INVITE (SDP Alice) SIP INVITE (SDP Alice) SIP INVITE (SDP Alice) SIP INVITE (SDP Alice) SIP INVITE (SDP Alice) SIP 302 Moved Temporarily SIP 302 Moved Temporarily SIP 302 Moved Temporarily Figure 5.6. CD Service Profiles 1) to 5) The INVITE request submitted by Alice's UA entity is received by Bob's UA entity. 6), 7), 8) Bob's UA entity responds with the message 302 Moved Temporarily. The response contains Carol's URI, to which the call should be forwarded. The response is intercepted by the TAS entity, which diverts the communication to Carol's UA entity. The following exchanges are identical to those described for CFU (5 to 17). 5.2.1.2. Identification presentation 5.2.1.2.1. OIP and OIR Originating identification presentation (OIP) consists of presenting the callee (Bob) with the identification of the caller (Alice), asserted by the IMS network. Alice's UA inserts into the INVITE request the header P P-Preferred- Identity, containing the public identity IMPU. INVITE sip:bob@homeB.net SIP/2.0 P-Preferred-Identity:<sip:alice@home1.net> The P-CSCF (Proxy-CSCF) entity replaces this header with the header P-Asserted-Identity. The value of this header is presented to Bob's UA entity if the identity of Alice was registered. Otherwise, the P-CSCF entity inserts in the header P-Asserted-Identity Alice's identity registered by default. INVITE sip:bob@homeB.net SIP/2.0