| 摘要 |
A method is disclosed of providing a call completion service to a not registered or not available user (CCNReg): - sending (9-10) a SUBSCRIBE message, from the originating application server (AS1) to the terminating I-CSCF, - then sending (11) a Location Information Request (LIR), from the terminating I-CSCF towards the HSS, requesting information about the terminating S-CSCF (S-CSCF2), - then sending (12) a Location Info Answer (LIA) containing S-CSCF capabilities or/and name, from the HSS to the terminating I-CSCF, - then assigning (13) a S-CSCF, referred to as the terminating S- CSCF (S-CSCF2), and forwarding the SUBSCRIBE message to said the terminating S-CSCF (S-CSCF2), - then sending (14) a Server Assignment Request (SAR) from the terminating (S-CSCF2) to the HSS, - then sending (15) a Server Assignment Answer (SAA) containing second user's profile info, from the HSS to the terminating S-CSCF (S-CSCF2), - then, forwarding (16) the SUBSCRIBE message to the terminating application server (AS2), for requiring to handle the CCNReg service), - and then sending (21 -23) a NOTIFY with the indication that the CCNReg subscription to the CCNReg service is active, and that the CCNReg request for the first user (User A) to communicate with the second user (User B) has been queued. |
